More like Clarion SF

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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.
The Man Who Fell to EarthNovel
Walter Tevisstandalone novel1963
Sad in tone, about loneliness, set in north america.
Childhood's EndNovel
Arthur C. Clarkestandalone novel1953
First contact, bittersweet in tone, about technological singularity, set in near future.
The Black CloudNovel
Fred Hoylestandalone novel1957
Hard science fiction, tense in tone, about survival, set in british isles.
The Kraken WakesNovel
John Wyndhamstandalone novel1953
Alien invasion, tense in tone, about survival and war.
“Earth's life is disrupted by the attacks of extraterrestrials whose war machines, emerging from the depths of the oceans, seem indestructible.”
from the catalogue
Calculating GodNovel
Robert J. Sawyerstandalone novel2000
First contact, about faith and religion, set in contemporary.
“The bulk of the novel covers the many discussions and arguments on this topic, as well as the nature of belief, religion, and science.”
from the catalogue