At a mansion on Sunset Boulevard, a group of police officers and photographers discover the body of Joe Gillis, floating face down in the swimming pool. In a flashback, Joe relates the events leading to his death.
Six months earlier, Joe was a down-on-his-luck screenwriter, trying to interest Paramount Pictures in a story he submitted. Script reader Betty Schaefer harshly critiques it, unaware that Joe is listening. Later, while fleeing from repossession men seeking his car, Joe turns into the driveway of a seemingly deserted mansion inhabited by forgotten silent film star Norma Desmond. Learning that Joe is a writer, Norma asks his opinion of a script she has written for a film about Salome. She plans to play the role herself in her return to the screen. Joe finds her script abysmal but flatters her into hiring him as a script doctor.