This book strongly implies that Rex Stout's famous detective, Nero Wolfe, is the the offspring of Sherlock Holmes and Irene Adler. If you don't know who Irene Adler is, you need to read " A Scandal in Bohemia" by Arthur Conan Doyle.
In this story, Auguste Lupa (an assumed name), lives in France and working as a chef. He becomes involved in an investigation into sabotage in a small town in France during World War I.
During his investigations, an intelligence agent is killed. He investigates the circumstances surrounding the mysterious death as well as the motivations.
This report prepared by Yosef Shapiro