Jake Gittes is a private investigator hired to look into an alleged affair of Hollis Mulwray. He discovers the case was a setup and Mulwray is later found dead. Gittes investigates further and learns of a water scandal involving Mulwray and Noah Cross, the wealthy and powerful father of Evelyn Mulwray. Evelyn hires Gittes to find her husband's killers. Gittes' investigation uncovers corruption and that Evelyn and her sister Katharine were victims of incest by Noah Cross. In the climactic ending, Evelyn is shot dead while trying to escape with Katharine from Noah and Gittes is left feeling responsible.