Detailed Instructions: Generate a correct and concise answer for the question based on the words in the context.
Problem:Context : Three Doors to Death is a collection of Nero Wolfe mystery novellas by Rex Stout, published by the Viking Press in 1950 -- itself collected in the omnibus volume Five of a Kind (Viking 1961). 
Question : The Three Doors to Death is part of a what series?
Solution:
Nero Wolfe