Man from the South

Man from the South is a short, sharp, chilling story from Roald Dahl, the master of the shocking tale.

In Man from the South, Roald Dahl, one of the world's favourite authors, tells a sinister story about the darker side of human nature. Here, a man takes part in a very unusual bet, one with appalling consequences . . .
-- https://www.penguin.co.uk/books/192000/man-from-the-south--a-roald-dahl-short-story-/9781405911047.html