More like Sentinels from Space

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The Black CloudNovel
Fred Hoylestandalone novel1957
Hard science fiction, about survival, set in our world and british isles.
The Puppet MastersNovel
Robert A. Heinleinstandalone novel1951
Alien invasion, about survival, set in north america.
“Parasitical aliens attach themselves to human hosts and take over their bodies.”
from the catalogue
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
Fifth PlanetNovel
Fred Hoyle & Geoffrey Hoylestandalone novel1963
Set in other star systems.
Alliance-UnionUniverse
universe173 books1976
Set in far future.
“Around that spine cluster the merchanter novels of trader Families, the Faded Sun trilogy of human envoys among the martial alien Mri, and the Chanur books, narrated from the hierarchical, whiskered viewpoint of the hani.”
from the catalogue
Start with Heavy Time →
includes Chanur, Mri Wars, Hanan Rebellion, Company Wars, The Hinder Stars, Age of Exploration, Era of Rapprochement, Unionside
CoDominiumUniverse
universe98 books1971
Military science fiction, set in other star systems and far future.
“The body of work runs along a few hard threads rather than one line.”
from the catalogue
Start with The Mote in God's Eye →
includes Moties, Laurie Jo Hansen, Falkenberg's Legion, War World