James Fenwick has made a deal with the devil: give me immortality in all ways except suicide, & you can have my soul if I do indeed commit suicide someday. But devil wants an up-payment - a part of the soul - a few unconscious memories James won't even notice missing.
Some years down the line, Fenwick is convinced the devil cheated him & took his soul itself. He will eventually get the memories devil took early, & come to regret...
- Isaac Asimov's "The Acquisitive Chuckle": Somewhat similar plot device. A conman is made to feel he's been cheated... with results rather satisfactory to the one conned.
Fact sheet.First published: Fantastic, January-February 1953.
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Related: Stories of Henry Kuttner; immortality in fiction.