More like Saucer

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FootfallNovel
Larry Niven & Jerry Pournellestandalone novel1985
Alien invasion, about survival and war, 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 Stonehenge GateNovel
Jack Williamsonstandalone novel2005
Adventure, mysterious in tone, set in other star systems.
“Stumbling on ancient stones in the Sahara Desert, four adventurous excavators and poker buddies realize that they have discovered a gateway to other worlds, from technologically advanced planets to primitive civilizations.”
from the catalogue
The WandererNovel
Fritz Leiberstandalone novel1964
About survival.
InvasionNovel
Robin Cookstandalone novel1997
Alien invasion, about genetic engineering, set in north america.
Have Space Suit - Will TravelNovel
Robert A. Heinleinstandalone novel1958
Space opera, about survival, set in near future.
“One minute Kip Russell was walking about in his own backyard, testing out an old space suit and dreaming about going to the moon - and the next he was out cold and the captive of an insidious space pirate.”
from the catalogue
The Apocalypse TrollNovel
David Weberstandalone novel1999
Time travel and alien invasion, about war.