More like Secret Sharers

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Stranger in a Strange LandNovel
Robert A. Heinleinstandalone novel1961
First contact, about faith and religion, set in north america and near future.
Childhood's EndNovel
Arthur C. Clarkestandalone novel1953
First contact, bittersweet in tone, about technological singularity, set in near future.
The Collected Stories of Robert Silverberg (Bantam)Series
series1 book1992
Science fiction, reflective in tone, about aliens and identity, set in far future.
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This ImmortalSeries
series2 books1966
Post-apocalyptic, adventurous in tone, about immortality and colonialism.
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TeixcalaanSeries
series2 books2019
Space opera, tense in tone, about political intrigue, set in other star systems.
“A Memory Called Empire and A Desolation Called Peace pair court intrigue with Mahit's conflicted, outsider fascination with an empire she can't help admiring.”
from the catalogue
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The Sirens of TitanNovel
Kurt Vonnegut & Jr.standalone novel1959
Space opera, funny in tone, set in mars.