Loreful
HomeDiscover
Search series, authors…⌘K
Loreful

Reading orders for SF/F series and shared universes — with your place kept in every one.

Explore

UniversesSeriesWorksAuthorsAtlas

Help

FAQAboutSite map

Account & legal

Sign inCreate accountPrivacyTerms

Data

Built on ISFDB, Wikipedia, Wikidata and Open Library. Curated reading orders carry their reasoning on the page; the rest follow publication order. Data sources & licenses

© Loreful · data: ISFDB · CC BY

More like Assignment: Eternity

anchored on:science fictionour worldlate 20th centurytime travelpolitical intriguenorth america+1 more

but

Mood

The mood the book leaves you in.

  • The reading experience is propelled by journeys, exploration, and physical risk; excitement and forward momentum dominate over dread or introspection.
  • Joy and loss are deliberately mixed; the resolution grants characters something real while taking something else away, leaving warmth and sorrow together.
  • The book demands work from the reader — dense prose, difficult structure, unfamiliar ideas, or morally uncomfortable material — as part of its intended effect.
  • Grim events, cruelty, or despair dominate the atmosphere, and the book does not soften them with comfort or comic relief.
  • The atmosphere is quietly unsettling — wrongness, unease, and the uncanny pervade the book without necessarily escalating into overt horror.
  • The book is built to move the reader; character feeling is foregrounded and major scenes aim at a strong emotional response.
  • Humor is a primary aim and the prose plays for laughs — comic situations, wit, or dialogue produce sustained comedy, not occasional levity.
  • The book insists that things can improve; effort and decency are shown to matter, and the arc bends toward better outcomes even through hardship.
  • The book teaches as it goes — real facts, history, science, or craft are conveyed in enough depth that learning is part of the reading experience.
  • The book is designed to uplift and motivate, presenting perseverance or achievement in a way that invites the reader to aspire or act.
  • The overall register is cheerful and easygoing; stakes are kept gentle and the book avoids dwelling on pain or dread.
  • Withheld information drives the experience; the book sustains enigmas and secrets the reader wants resolved, whatever its genre.
  • The book is contemplative and inward-looking, giving more weight to thought, memory, and meaning than to external events.
  • The book works as comfort reading — low tension, a soothing pace, and an atmosphere the reader can unwind in.
  • Grief, loss, or melancholy set the dominant register, and the book lets sorrow stand rather than resolving it into comfort.
  • Sustained suspense is the point; the book keeps the reader braced for what happens next through danger, pressure, or impending revelation.
  • Playful invention and charm define the register — fanciful conceits, light absurdity, and a narration that delights in its own oddity.

About

What the story runs on.

  • Stories in which extraterrestrial beings are central — as characters, cultures, or the object of the plot.
  • Stories structured as a quest — a journey undertaken to find, deliver, or destroy something of great import.
  • Stories in which staying alive against nature, catastrophe, or scarcity is the central problem.
  • Stories of lovers kept apart by law, family, faith, or station, where the obstacle to love is the plot.
  • Stories in which a friendship — its making, testing, or loss — is the emotional center.
  • Stories of growing up — a young protagonist crossing from childhood into adult knowledge and responsibility.
  • Stories about who a character truly is — self-discovery, doubled lives, and the search for a self.
  • Stories about mourning — living through the death of a loved one and what loss does to the survivors.
  • Stories in which a buried family truth — hidden parentage, crimes, or shames — surfaces and reorders the present.
  • Stories driven by maneuvering for power — factions, conspiracies, and statecraft conducted in shadow.
  • Stories in which war itself is the subject — combat, occupation, and what warfare does to soldiers and civilians.
  • Stories organized around investigating a killing — the case, the clues, and the pursuit of the killer, in any genre's clothing.

Shelf

Where it sits in the library.

    • Fiction built on magic or other supernatural elements that have no scientific explanation.
    • Secondary-world fantasy at large scale, where the fate of nations or the world turns on the protagonists' struggle.
    • Fantasy set in a recognizably modern city or contemporary world where the supernatural intrudes on everyday life.
    • Fantasy that blends in horror's atmosphere and imagery, keeping a fantastical frame around grim or frightening material.
    • Action-driven fantasy following warriors or rogues with personal stakes against sorcerous threats, rather than world-spanning conflicts.
    • Fantasy set in a real historical period or a close analogue of one, with magic woven into the era.
    • Fantasy in which protagonists cross from the ordinary world into another world through a portal or similar passage.
    • Fiction that retells or reworks a traditional fairy tale in a new form or setting.
    • Fantasy drawing directly on myths, legends, and folklore, retelling them or building on their figures and logic.
    • Fantasy of ghosts, vampires, shapeshifters, psychics, and similar phenomena, usually set in an otherwise ordinary world.
    • Fiction mixing science-fictional trappings with overtly magical or impossible elements in one setting.
    • Low-stakes fantasy emphasizing comfort, community, and everyday pleasures over conflict and peril.
    • Speculative fiction of pervasive moral ambiguity, violence, and cynicism that rejects heroic conventions — fantasy and SF alike.
      • Fiction that extrapolates from science and technology — future societies, space travel, or speculative inventions — within at least nominally natural laws.
      • Science fiction of interstellar scope — starships, galactic polities, and adventure across star systems.
      • Science fiction committed to scientific rigor, where technical plausibility constrains the story.
      • Science fiction centered on armed forces and warfare, told largely from a military point of view.
      • Science fiction of networked, corporate-dominated near futures, pairing high technology with social decay.
      • Science fiction styled on nineteenth-century steam-powered technology, often in a Victorian or pseudo-Victorian setting.
      • Fiction depicting an oppressive or catastrophic society, presented as a warning.
      • Fiction set after civilization's collapse, following survivors in the ruins of the old world.
      • Fiction in which characters move between past and future, and the mechanics or consequences of that travel drive the plot.
      • Fiction exploring a world where a historical event went differently and history diverged from ours.
      • Science fiction about humanity's first encounter and communication with an alien intelligence.
      • Science fiction in which extraterrestrial forces attack or occupy Earth and humanity resists.
      • Fiction whose primary aim is to frighten or unsettle the reader through dread, menace, or the monstrous.
      • Horror of vast, indifferent, incomprehensible entities before which humanity is insignificant, in the Lovecraft tradition.
      • Horror of decaying houses, buried family secrets, and oppressive atmosphere in the Gothic literary tradition.
      • Horror centered on hauntings and the returning dead.
      • Horror located in the mind — paranoia, obsession, and unreliable perception rather than external monsters.
      • Horror built around the reanimated dead and survival amid their outbreaks.
      • Horror defined by explicit, transgressive gore that refuses to cut away from violence.
      • Speculative fiction of the strange and uncanny that resists both natural explanation and standard genre categories.
      • Fiction organized around solving a crime or puzzle, typically following an investigator toward the identification of a culprit.
      • A puzzle-first mystery that lays out clues so the culprit's identity can be deduced before the reveal.
      • Crime fiction of moral ambiguity, fatalism, and hard-edged style, set among the corrupt and the doomed.
      • A mystery following the realistic routines of police work — forensics, interviews, and case-building.
      • A gentle mystery with an amateur sleuth, a small community, and violence kept off the page.
      • A mystery set in a past era, where the investigation works within that period's methods and society.
      • Fast-paced fiction driven by imminent danger, pursuit, or high-stakes conspiracy, built to sustain tension.
      • A thriller of espionage — agents, tradecraft, and intelligence services in conflict.
      • A thriller centered on lawyers and the courtroom, where litigation carries the suspense.
      • A thriller driven by detailed contemporary or near-future technology, often military or scientific.
      • A thriller whose tension comes from mental states and manipulation between characters rather than external action.
      • Fiction whose central plot is a romantic relationship and its development toward an emotionally satisfying resolution.
      • Romance in which one or both partners are supernatural beings, blending fantasy elements into the love story.
      • A fantasy-romance hybrid in which the romantic arc and the fantasy plot carry equal weight.
      • Romance set in a past era, with courtship shaped by the period's society and manners.
      • Romance set in the present day, without supernatural or historical elements.
      • Fiction set in a real past period, where the historical setting materially shapes characters and events.
        • General and literary fiction emphasizing prose style, character interiority, or formal ambition over genre plot conventions.
        • Fiction in a realistic world where magical events occur and are treated as ordinary, in the tradition of Latin American literature.
        • Fiction that ridicules people, institutions, or society in order to criticize them.
        • Fiction of dreamlike, irrational imagery and logic that breaks from realistic representation.
        • Fiction that plays with narrative convention through metafiction, fragmentation, and self-reference.
        • Fiction propelled by journeys, exploration, and physical peril, where action and survival carry the plot.
        • Adventure fiction of ships and seafaring — naval engagements, voyages, and life at sea.
        • Fiction of the American frontier West — gunmen, ranchers, and lawmen, typically in the late nineteenth century.
        • Fiction centered on soldiers, campaigns, and the experience of warfare, historical or imagined.
          • Fiction written primarily to amuse, using comedic situations, wit, or parody as its organizing principle.
            • Multi-generational fiction following a family or dynasty across decades, with inheritance and kinship as the through-line.
              • Fiction whose world runs on explicit game mechanics — levels, stats, and skills that characters can see and exploit.
                • Fiction about costumed or superpowered heroes and their conflicts with comparable villains.

                Practical

                How long a commitment, whether it stands alone, and whether it has finished.

                Tap a chip to ask for it · tap again to rule it out · once more to clear. Numbers show what would be left.

                • Cover of The Masks of Time
                  The Masks of Time

                  Robert Silverberg · standalone novel · 1968

                  similar bypolitical intriguetenselate 20th centuryscience fictiontime travelour worldmysterious

                  From the back cover of the Ballantine first edition: "The year is 1999. The century is about to turn. The civilized world is prosperous but tense with fear about the still existing possibility of a major war. While in the large area that used called "underdeveloped" there is a hysterical conviction that the world will cone to an end with the arrival of the new century Into this explosive situation floats a creature calling himself Vornam-19 - and claiming to be a visitor from 1000 years in the future... The world is ready, indeed ripe, for a sign, an omen, a new cult. But no one realizes exactly what Vornaa-19 is in his own right."

                • Cover of When the Sleeper Wakes
                  When the Sleeper Wakes

                  H. G. Wells · standalone novel · 1899

                  similar bypolitical intriguetensescience fictiontime travelour world

                  Graham, an insomniac Englishman in 1890s London, takes a course of sleep-inducing drugs and falls into a coma that lasts two centuries. He wakes in the year 2100 to find his investments have compounded, through a ruling body called the White Council, into effective ownership of most of the world's wealth and power, making him, on paper, humanity's master, and in practice, its prisoner, held under guard while the Council governs in his name. A rebel faction led by a man named Ostrog frees him, hoping to use his symbolic authority to spark an uprising against the Council. An early H. G. Wells dystopia about inherited power and manufactured consent.

                • Cover of Departure
                  Departure

                  A. G. Riddle · standalone novel · 2014

                  similar bypolitical intriguetensescience fictiontime travelour worldmysterious

                  "The world's past and future rests in the hands of five unwitting strangers in this definitive edition of A. G. Riddle's time-traveling, mind-bending speculative thriller. En route to London from New York, Flight 305 suddenly loses power and crash-lands in the English countryside, plunging a group of strangers into a mysterious adventure that will have repercussions for all of humankind.Struggling to stay alive, the survivors soon realize that the world they've crashed in is very different from the one they left. But where are they? Why are they here? And how will they get back home? Five passengers seem to hold clues about what's really going on: writer Harper Lane, venture capitalist Nick Stone, German genetic researcher Sabrina Schroeder, computer scientist Yul Tan, and Grayson Shaw, the son of a billionaire philanthropist.As more facts about the crash emerge, it becomes clear that some in this group know more than they're letting on--answers that will lead Harper and Nick to uncover a far-reaching conspiracy involving their own lives. As they begin to piece together the truth, they discover they have the power to change the future and the past--to save our world. or end it. A wildly inventive and propulsive adventure full of hairpin twists, Departure is a thrilling tale that weaves together power, ambition, fate, memory, and love, from a bold and visionary talent"--

                • Cover of Termination Shock
                  Termination Shock

                  Neal Stephenson · standalone novel · 2021

                  similar bypolitical intriguetensescience fictionour worldnorth america

                  Termination Shock is a science fiction novel by American writer Neal Stephenson, published in 2021. The book is set in a near-future when climate change has significantly altered human society and follows the attempts of a solar geoengineering scheme. The novel focuses on the geopolitical and social consequences of the rogue fix for climate change, themes common in the growing climate fiction genre.

                • Cover of The Oracle Year
                  The Oracle Year

                  Charles Soule · standalone novel · 2018

                  similar bypolitical intriguetensescience fictionour worldmysteriousnorth america

                  Awakening from a dream with more than one hundred predictions about the future in his head, an unassuming Manhattan bassist becomes one of the world's most powerful men and hides his identity behind an online persona that is targeted by greedy corporations and dangerous enemies.

                • Cover of Carrion Comfort
                  Carrion Comfort

                  Dan Simmons · standalone novel · 1989

                  similar bytenselate 20th centuryscience fictionour worldnorth america+1 more

                  Carrion Comfort is a science fiction/horror novel by American writer Dan Simmons, published in 1989 in hardcover by Dark Harvest and in 1990 in paperback by Warner Books. It won the Bram Stoker Award, the Locus Poll Award for Best Horror Novel, and the August Derleth Award for Best Novel. It is based on a novelette of the same title, published in 1983 in the magazine Omni. The first half of the novelette makes up chapter 1 of the novel, while the second half forms chapter 3.

                • Cover of Dune
                  Dune

                  series · 20 books · 1963

                  part of Dune Universe

                  similar bypolitical intriguescience fiction+1 more

                  Frank Herbert's Dune Chronicles opens with 1965's Dune, set on the desert planet Arrakis where House Atreides takes control of the only source of the vital spice melange and young Paul Atreides is pulled into a struggle over its politics and religion. Herbert carried the story forward across five further novels — Dune Messiah, Children of Dune, God Emperor of Dune, Heretics of Dune, and Chapterhouse: Dune — following Paul's line over the following millennia, before Brian Herbert and Kevin J. Anderson later extended the saga. Many other editions of these six novels are omnibus and box-set repackagings rather than separate stories.

                • Cover of The War in the Air
                  The War in the Air

                  H. G. Wells · standalone novel · 1908

                  similar bypolitical intriguetensescience fictionour world+1 more

                  The War in the Air: And Particularly How Mr. Bert Smallways Fared While It Lasted is a military science fiction novel written by H. G. Wells and published in 1908.

                • Cover of Deception Point
                  Deception Point

                  Dan Brown · standalone novel · 2001

                  similar bypolitical intriguetenseour worldmysterious+1 more

                  Deception Point is a 2001 mystery-thriller novel by American author Dan Brown. It is Brown's third novel. It was published by Simon & Schuster.

                • Cover of Dune Universe
                  Dune Universe

                  universe · 78 books · 1963

                  Start hereDune · Start here

                  similar bypolitical intriguescience fiction+1 more

                  Arrakis. Dune. The desert planet, where empire runs on a single substance: the spice melange, which folds space, prolongs life, and unlocks prescience, and which exists nowhere else in the known universe. Frank Herbert's saga is a meditation dressed as an adventure — feudal houses and a secret sisterhood, engineered messiahs and the patient ecology of a world without water, all turning on the terrible gravity of who commands the spice. It reads like scripture and schemes like a war room, ten thousand years hence, among people who have outlawed the thinking machine and made instruments of themselves instead. At its heart stand Herbert's original six — Dune, Dune Messiah, Children of Dune, God Emperor of Dune, Heretics of Dune, Chapterhouse: Dune — a single deepening arc across millennia, arguing the whole way between prophecy and free will. Around that spine his son Brian Herbert and Kevin J. Anderson have raised a vast prequel architecture: Prelude to Dune, tracing the great houses a generation before Paul; Legends of Dune, reaching back to the crusade that broke the machines; the Schools of Dune cycle on the founding of Bene Gesserit, Mentat, and Navigator; the Caladan Trilogy and Heroes of Dune filling years the originals left in shadow. Many hands, dozens of volumes, one desert. What sets Dune apart is its refusal of the simple: religion is manufactured, heroes are hazards, and the sand itself — worm, water, ecology — acts as a political power. Begin where the universe did, with Frank Herbert's Dune (1965), and read the original six in order; you need nothing else to feel the full weight. The prequels are a country to explore afterward, taken by era. Beginnings are delicate times.

                • Cover of Mother of Storms
                  Mother of Storms

                  John Barnes · standalone novel · 1994

                  similar bypolitical intriguetensescience fictionour world+1 more

                  From the flaps of the Tor first edition: "It is 2028. A strike to destroy an illegal Arctic weapons cache has a catastrophic side effect. Massive amounts of energy are liberated from the polar ice, suddenly warming the Earth's climate. In the middle of the Pacific, a gigantic hurricane thousands of miles across is forming, larger than any in human history. A storm with winds of supersonic speed. A storm that changes direction at whim. A storm that refuses to die. A storm so vast it spawns dozens more in its wake... Blinded by intrigue, expedience, and greed, the world's politicians and power brokers have ignored the killer storms threat until it is too late. Already the death toll is in the tens of millions, as it savages the Pacific coast, while its devil's brood of smaller storms are wreaking havoc across the face of the planet. While the survivors scramble for advantage, a handful of courageous men and women undertake a daring, desperate plan to save humanity from total destruction - a plan so visionary it may alter forever the future of the human race."

                • Cover of The World Jones Made
                  The World Jones Made

                  Philip K. Dick · standalone novel · 1956

                  similar bypolitical intriguetensescience fictionnorth america+1 more

                  The World Jones Made is a 1956 science fiction novel by American writer Philip K. Dick, examining notions of precognition, humanity, and politics. It was first published by Ace Books as one half of Ace Double D-150, bound dos-à-dos with Agent of the Unknown by Margaret St. Clair.The story takes place after a nuclear war in which society is dominated by relativism, which rejects absolute truths and preaches tolerance as the highest principle. The mutant Floyd Jones, who can see into the future, plans to overthrow the system and colonise space. The story ends with the defeat of Jones, whose plans fail despite his ability to see the future due to the immutability of fate.

                • Cover of The Children of Men
                  The Children of Men

                  P. D. James · standalone novel · 1992

                  similar bypolitical intriguetensescience fictionour world

                  "The human race has become infertile, and under the despotic rule of Xan Lyppiatt, the Warden of England the old are despairing and the young cruel. Theo Faren, a cousin of the Warden, lives a solitary life in this ominous atmosphere. That is, until a chance encounter with a young woman leads him into contact with a group of dissenters. Suddenly his life is changed irrevocably, as he faces agonising choices which could affect the future of mankind." (pdjames.co.uk)

                • Cover of Maurai
                  Maurai

                  series · 6 books · 1959

                  completed

                  similar bypolitical intriguescience fictionour world+3 more

                  The Maurai series is a series of short stories and a novel by Poul Anderson set in a resource depleted, post-apocalyptic earth several centuries in the future. The series is named after its most frequent protagonists, citizens of the Maurai Federation. The Maurai dominate the Pacific and Indian Oceans. Fearful of the social and ecological implications of a return to large-scale industrial society, they use their considerable might and covert resources to prevent other nations from developing nuclear power.

                • Cover of The Coming
                  The Coming

                  Joe Haldeman · standalone novel · 2000

                  similar bypolitical intriguetensescience fictionour worldnorth america

                  An astronomy professor in Florida in a mid-21st century suffering from climate change and international hostilities detects an apparent interstellar vehicle headed directly for earth at near light speed but decelerating dramatically; it transmits the message "We're coming". The effect this discovery has on her, those close to her, and the surrounding circles of contacts is followed, as the impending event plays out on the larger stage of national and international affairs until it comes to an unpredictable ending. The dedication page says in part "The author gratefully acknowledges the influence of James Gunn's beautiful novel The Listeners, on this book."

                • Cover of Islands in the Net
                  Islands in the Net

                  Bruce Sterling · standalone novel · 1988

                  similar bypolitical intriguetensescience fictionour world

                  Islands in the Net is a 1988 science fiction novel by American writer Bruce Sterling. It won the John W. Campbell Memorial Award for Best Science Fiction Novel in 1989, and was nominated for both the Hugo and Locus Awards that same year. It offers a view of an early 21st century world, apparently peaceful, with delocalised, networking corporations. The protagonist, swept up in events beyond her control, finds herself in places that are off the net, from a datahaven in Grenada, to a Singapore under terrorist attack, to the poorest and most disaster-struck parts of Africa.

                • Cover of Solar Lottery
                  Solar Lottery

                  Philip K. Dick · standalone novel · 1955

                  similar bypolitical intriguetensescience fictionour world

                  Solar Lottery is a 1955 science fiction novel by American writer Philip K. Dick. It was his first published novel and contains many of the themes present in his later work. It was also published in altered form in the UK as World of Chance. The main story is about a man named Ted Benteley who lives in a strange world, dominated by percentages and the lottery. Lotteries are used to choose the next leader as well as a new assassin, whose job is to try to kill the leader or "Quizmaster". Everybody in society has the opportunity to be selected as a leader or an assassin. Benteley unexpectedly gets chosen to be a member of the committee trying to assassinate the new Quizmaster and he must decide what he is going to do.

                • Cover of World Out of Mind
                  World Out of Mind

                  J. T. McIntosh · standalone novel · 1953

                  similar bypolitical intriguetensescience fictionour worldnorth america+1 more

                  "An alien hostile take-over of Earth is planned by placing 50,000 espionage agents in strategically important positions, including the President of the United States." (cited from {{A|Peter Young}}'s review in Big Sky #2)

                • Cover of Bug Jack Barron
                  Bug Jack Barron

                  Norman Spinrad · standalone novel · 1969

                  similar bypolitical intriguetensescience fictionnorth america

                  Bug Jack Barron is a 1969 science fiction novel by American writer Norman Spinrad, first serialized in the New Worlds magazine under the editorship of Michael Moorcock. It was nominated for the 1970 Hugo Award. The novel is notable for its lyrical style and unique use of cut-up phrases. In this regard, Spinrad has cited the influence of Beat writers William S. Burroughs, Allen Ginsberg, and Jack Kerouac.

                • Cover of The Last Day
                  The Last Day

                  Glenn Kleier · standalone novel · 1997

                  similar bytenselate 20th centuryscience fictionour worldmysterious+1 more

                  From the flaps of the Warner Books first printing: "The final week of 1999 draws to a close. Billions prepare for the inevitable letdown. Billions more hold their breath. Will the wild fantasies of New Age zealots be realized and the world we know end? Will the dawn of a new era be marked by profound occurrences? Or will it be just one more New Year's day? Suddenly and terrifyingly, everyone's question is answered. On Christmas Eve, fiery destruction rains down on a secret scientific installation in the Negev desert. Then at midnight on New Year's Eve, a beautiful young woman appears, displaying a strange and awesome gift. The extraordinary powers of this ethereal creature foster both jubilation and alarm. Drawn into the most intimate bond of all is Jon Feldman, seasoned TV correspondent. An inveterate skeptic, Feldman finds himself caught in the woman's spell even as others argue that she is a Trojan Horse, come to wreck devastation on humanity. Forced to confront his deepest fears as he simultaneously probes a conspiracy at the outermost limits of bioengineering, Felman will find what he seeks - in a single heartbeat that could end his life and that will forever alter his very being."

                • Cover of Snow Crash
                  Snow Crash

                  Neal Stephenson · standalone novel · 1992

                  similar bypolitical intriguetensescience fiction

                  Snow Crash is a 1992 science fiction novel by Neal Stephenson. Like many of Stephenson's novels, its themes include history, linguistics, anthropology, archaeology, religion, computer science, politics, cryptography, memetics, and philosophy.

                • Cover of Under the Dome
                  Under the Dome

                  Stephen King · standalone novel · 2009

                  similar bypolitical intriguetensescience fictionnorth america

                  A small town in Maine finds itself suddenly cut off from the outside world by an impenetrable barrier, and the clash of personalities of the trapped people takes its inexorable devastating course.

                • Cover of The Future of Another Timeline
                  The Future of Another Timeline

                  Annalee Newitz · standalone novel · 2019

                  similar bypolitical intriguetensescience fictiontime travelnorth america

                  The Future of Another Timeline is a 2019 science fiction novel by Annalee Newitz. The feminist time-travel adventure follows Tess, a professional time traveler, geoscientist, and secretly a member of the Daughters of Harriet (Tubman), who are working to make the future better for women.

                • Cover of The Themis Files
                  The Themis Files

                  series · 3 books · 2015

                  similar bytensescience fictionmysteriousour world+2 more

                  Sylvain Neuvel's Themis Files opens when a girl falls into a hole in South Dakota and lands on the palm of a giant metal hand buried underground; the trilogy picks up years later as she leads the team trying to determine what the hand is part of and why it's there. Sleeping Giants and its sequels are told almost entirely through interview transcripts conducted by an unnamed, evasive interrogator, giving the series a documentary, oral-history feel unusual for first-contact SF. The mystery escalates from an archaeological puzzle into a question of who else is looking for the same answer.