More like Fireball

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InterWorldSeries
series3 books2007
Science fantasy and portal fantasy, about coming of age, set in parallel universe.
“Michael Reaves developed the story with Neil Gaiman, and Reaves's daughter Mallory Reaves co-wrote the two sequels.”
from the catalogue
Start with InterWorld →
Paratime PoliceSeries
series33 books1948
Science fiction and alternate history, adventurous in tone.
“The protagonists of the stories are the Paratime Police, the organization that protects the secret of paratime travel.”
from the catalogue
Start with He Walked Around the Horses →
Out of Their MindsNovel
Clifford D. Simakstandalone novel1970
Fantasy, whimsical in tone, set in our world.
“What if their world were real - if vampires, devils and Don Quixote hobnobbed with Dagwood Bumstead and Charlie Brown.”
from the catalogue
Eden (Harry Harrison)Series
series5 books1984
completed
About survival and war, set in prehistoric.
“Harry Harrison's Eden trilogy imagines an Earth where the dinosaurs never died out, evolving instead into the Yilane, a technologically advanced reptilian civilization that shares the planet uneasily with early humans.”
from the catalogue
Start with West of Eden →
Moorcock's MultiverseUniverse
universe102 books1961
Set in secondary world.
“The Multiverse is not one world but an endless lattice of them, worlds folded within worlds, each a variation on the last — and through every one of them walks a single conscripted soul.”
from the catalogue
Start with Elric of Melniboné →
includes Oswald Bastable, Warrior of Mars, Eternal Champion, Corum, Hawkmoon, The Elric Saga
The Secret SeaNovel
Barry Lygastandalone novel2016
Mysterious in tone, about survival, set in parallel universe.
“As Zak unravels the mystery behind the voice, he faces decisions that may mean the end of their world at home-- if they can even get home!”
from the catalogue