More like The Decision

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AnimorphsUniverse
universe66 books1996
Science fiction and science fantasy, tense in tone, about aliens and shapeshifters, set in contemporary and our world.
“The Yeerks are grey slugs the length of your thumb.”
from the catalogue
Start with The Invasion →
includes Megamorphs, Alternamorphs, The Animorph Chronicles
FootfallNovel
Larry Niven & Jerry Pournellestandalone novel1985
Alien invasion and first contact, about survival, set in north america.
“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 Kraken WakesNovel
John Wyndhamstandalone novel1953
Alien invasion, about survival, set in mid 20th century and at sea.
“Earth's life is disrupted by the attacks of extraterrestrials whose war machines, emerging from the depths of the oceans, seem indestructible.”
from the catalogue
The VisitorsNovel
Clifford D. Simakstandalone novel1980
First contact, mysterious in tone, 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
The WandererNovel
Fritz Leiberstandalone novel1964
About survival, set in space.
The Apocalypse TrollNovel
David Weberstandalone novel1999
Time travel and alien invasion, adventurous in tone.