More like Apollo Quartet

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Way StationNovel
Clifford D. Simakstandalone novel1963
First contact, about aliens and loneliness, set in countryside & village.
“The human operator of a transfer station for aliens traveling between planets, kept secret from the human race, deals with discovery by the US government and interplanetary political crisis, as well as his own emotional issues.”
from the catalogue
The Man Who Fell to EarthNovel
Walter Tevisstandalone novel1963
Sad in tone, about aliens and loneliness, set in our world.
Trouble with LichenNovel
John Wyndhamstandalone novel1960
About immortality, set in british isles.
“Biochemists Diana Brackley and Francis Saxover, working independently, both isolate a compound from a rare lichen that appears to dramatically slow the aging process.”
from the catalogue
Earth AbidesNovel
George R. Stewartstandalone novel1949
Post-apocalyptic, about plague and pandemic and ecological collapse.
“Set in the 1940s in Berkeley, California, the story is told by Isherwood Williams, who emerges from isolation in the mountains to find almost everyone dead. en.wikipedia.org”
from the catalogue
Venus Plus XNovel
Theodore Sturgeonstandalone novel1960
Challenging in tone, about identity, set in otherworld.
“Charlie Johns wakes in a featureless silver room with no memory of how he got there and a watch that's inexplicably running backward.”
from the catalogue
Ring Around the SunNovel
Clifford D. Simakstandalone novel1953
About class conflict, set in parallel universe and our world.