The Complete Short SF of Fredric Brown
Fredric Brown is arguably the finest writer of science-fiction short stories ever, just as Jorge Luis Borges is the master of the metaphysical fantastic stories.
Curiously, his SF work is more easily available abroad, notably the French translations by Denoël, than in his native US, and most of his books still in print are his mystery novels. This is why I applaud the NESFA’s decision to collect and reprint all the short stories.
Many of these are masterpieces of the genre, with surprising endings that pack a wallop. If you like the TV series “The Twilight Zone”, you know what I mean. Many of them are technically not SF, like the bawdy “The ring of Hans Carvel” in which a medieval man sells his soul for a way to keep his young wife faithful, but they are all extremely enjoyable.