"Bitter End" is the first Nero Wolfe mystery novella by Rex Stout, originally published in the November 1940 issue of The American Magazine.

"Bitter End" first appeared in book form in the posthumous limited-edition collection Corsage: A Bouquet of Rex Stout and Nero Wolfe edited by Michael Bourne, published in 1977 by James A.

The investigation takes a turn for the worse when Archie Goodwin finds Arthur Tingley's body in his office and Amy Duncan at the scene, unconscious from a blow to the head.

With the looting of papers at Tingley's office, the murder may not be related to the product tampering, but rather the curious birth and adoption of Philip who may be set to inherit the business.

Rex Stout's publisher Farrar & Rinehart scheduled the Tecumseh Fox novel Bad for Business for November 1940 release.