The Body in the Library by Agatha Christie

Agatha wrote The Body in the Library almost as a joke. She acknowledged that finding "a body in the library" was an English detective novel cliche and this book was her amusing take on it. She name checks herself when a small boy says he has lots of detective novelists' autographs and her name is among those he lists. And although Miss Marple is the star of the novel and the solver of the mystery, there are as many detectives here as there are suspects, with Sir Henry Clithering (another recurrent character) helping out in addition to the three different official police detectives. This is only Miss Marple's second appearance in a Christie novel, her first being The Murder at the Vicarage in 1930, 12 years earlier.