Howard Haycraft, author of the seminal Murder for Pleasure: The Life and Times of the Detective Story, wrote during 1941 that H.M. or "The Old Man" was "the present writer's admitted favorite among contemporary fictional sleuths".
Howard Haycraft, Autor des wegweisenden Buches Murder for Pleasure: The Life and Times of the Detective Story, schrieb 1941 dass H.M. oder „Der alte Mann“ der „gegenwärtig vom Autor zugegebene Favorit unter den zeitgenössischen fiktionalen Schnüfflern“ sei.