It’s a mystery
The Mystery Writers of America once compiled a list of the top 100 Crime Novels of all time, picking ten in each of the following categories: Classics (1-10) Suspense (11-20) Hardboiled/Private Eye (21-30) Police Procedural (31-41 ? there was a tie between #40 and #41) Espionage/Thriller (42-51) Criminal (52-61) Cozy/Traditional (62-71) Historical (72-81) Humorous (82-91) …