More like The Unknown

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AnimorphsUniverse
universe66 books1996
Science fantasy and science fiction, tense in tone, about aliens, 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, The Animorph Chronicles, Alternamorphs
FootfallNovel
Larry Niven & Jerry Pournellestandalone novel1985
Alien invasion and first contact, about survival.
“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 Andromeda StrainSeries
series2 books1969
About plague and pandemic and survival.
“Daniel H. Wilson's authorized 2019 sequel The Andromeda Evolution revisits the same threat five decades later.”
from the catalogue
Start with The Andromeda Strain →
CellNovel
Stephen Kingstandalone novel2006
Post-apocalyptic and horror, about survival and plague and pandemic.
“In Cell, King taps into readers fears of technological warfare and terrorism.”
from the catalogue
InvasionNovel
Robin Cookstandalone novel1997
Alien invasion and thriller & suspense, about genetic engineering.
DreamcatcherNovel
Stephen Kingstandalone novel2001
Horror and alien invasion, about survival and friendship.
“According to the author in his afterword, the working title was Cancer.”
from the catalogue