TERROR OF THE RUE MORGUE is a classic horror novel by Edgar Allan Poe, first published in 1841. It is considered to be the first modern detective story and is credited with pioneering the genre of detective fiction. The novel follows the investigation of a mysterious double murder in Paris, France, by an unnamed narrator and his friend, the amateur detective C. Auguste Dupin. The crossword solution for this term is APE, which is a reference to the novel's antagonist, an escaped orangutan that is responsible for the murders.