Henry Kuttner's "By These Presents" aka "Satan Sends Flowers" (short story, immortality, free)

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...

See also.

1. 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.
Download full text.
Rating: B.
Related: Stories of Henry Kuttner; immortality in fiction.