More like Sinister Barrier

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The VisitorsNovel
Clifford D. Simakstandalone novel1980
First contact, about survival, set in north america.
“WorldCat: Intelligent, alien creatures arrive on Earth from outer space, threatening world stability and presaging the destruction of civilization.”
from the catalogue
FootfallNovel
Larry Niven & Jerry Pournellestandalone novel1985
Alien invasion and first contact, about survival and war.
“When aliens travel to Earth from Alpha Centauri, differences between alien and human psychology result in an unprovoked invasion, and the resulting resistance results in the aliens' use of a devastating weapon.”
from the catalogue
The Long TwilightNovel
Keith Laumerstandalone novel1969
About immortality, set in spaceship.
SphereNovel
Michael Crichtonstandalone novel1987
Thriller & suspense, set in underwater and spaceship.
“Keeping Top Secret, the US Navy is guarding a gigantic spaceship that has been lying on the Pacific ocean floor for centuries, overgrown with corals.”
from the catalogue
ChockySeries
series2 books1968
Science fiction, mysterious in tone, about aliens, set in contemporary.
“The BBC produced a radio adaption by John Tydeman in 1967.”
from the catalogue
Start with Chocky →
The Themis FilesSeries
series3 books2015
About robots.
“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.”
from the catalogue
Start with Sleeping Giants →