
However, this kind of “twist ending” is now fairly common in literature, even mystery novels.

Christie infamously violated the first of Knox’s commandments-that the murderer shouldn’t be the narrator of the book. Perhaps the most influential work in the detective genre is A Study in Scarlet (1886) by Arthur Conan Doyle, which introduced Sherlock Holmes to the world, while Edgar Allan Poe arguably invented the genre with his stories about the detective Auguste Dupin, starting with “The Murders in the Rue Morgue.” Readers who are interested in the theory and literary structure of detective novels should consult “Knox’s Ten Commandment of Detective Fiction,” a short, somewhat tongue-in-cheek list of rules for detective fiction that was considered the gospel for early 20th-century mystery writers.
