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FootfallNovel
Larry Niven & Jerry Pournellestandalone novel1985
About 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
InvasionNovel
Robin Cookstandalone novel1997
About genetic engineering.
The VisitorsNovel
Clifford D. Simakstandalone novel1980
Mysterious in tone.
“WorldCat: Intelligent, alien creatures arrive on Earth from outer space, threatening world stability and presaging the destruction of civilization.”
from the catalogue
The Puppet MastersNovel
Robert A. Heinleinstandalone novel1951
Set in mid 20th century.
“Parasitical aliens attach themselves to human hosts and take over their bodies.”
from the catalogue
DreamcatcherNovel
Stephen Kingstandalone novel2001
Horror, dark in tone, about friendship.
“According to the author in his afterword, the working title was Cancer.”
from the catalogue
The Apocalypse TrollNovel
David Weberstandalone novel1999
Time travel, about war.