The Big Sleep is a 1946 film directed by Howard Hawks, the first film version of Raymond Chandler's 1939 novel of the same name. The movie stars Humphrey Bogart as detective Philip Marlowe and Lauren Bacall as the female lead in a film about the "process of a criminal investigation, not its results." William Faulkner, Leigh Brackett, and Jules Furthman co-wrote the screenplay.
In 1997, the U.S. Library of Congress deemed the film "culturally, historically, or aesthetically significant," and added it to the National Film Registry.
The Big Sleep is known for its convoluted plot. During filming, allegedly neither the director nor the screenwriters knew whether chauffeur Owen Taylor was murdered or had killed himself. They sent a cable to Chandler, who told a friend in a later letter: "They sent me a wire, asking me, and dammit I didn't know either"