The Nero Wolfe book that wasn't.

Cover of
At Wolfe's Door:
The Nero Wolfe Novels
of Rex Stout
by J. K. Van Dover

The Wolfe Pack took a July jaunt to the Rex Stout Papers at Boston College and returned with scans of some interesting items such as a fan letter from P. G. Wodehouse and Stiff Upper Lipstick, the Nero Wolfe book that never existed yet had a summary and cover art—because some at Viking did not understand that it was a joke.