"American Psycho" is a novel written by Bret Easton Ellis, published in 1991. It follows the life of Patrick Bateman, a wealthy investment banker in New York City during the 1980s. The story explores themes of consumerism, identity, and the superficial nature of society, as Bateman leads a double life as a serial killer. The book is known for its graphic violence and dark humor, which sparked significant controversy upon its release. It was later adapted into a film in 2000, starring Christian Bale as Bateman. The film further popularized the story and its critique of materialism and moral emptiness.