Chinatown is a 1974 American neonoir mystery film, directed by Roman Polanski from a screenplay by Robert Towne, starring Jack Nicholson and Faye Dunaway. The film was inspired by the California Water Wars, a series of disputes over southern California water at the beginning of the 20th century, by which Los Angeles interests secured water rights in the Owens Valley. The Robert Evans production, a Paramount Pictures release, was the directors last film in the United States and features many elements of film noir, particularly a multilayered story that is part mystery and part psychological drama.
A woman identifying herself as Evelyn Mulwray hires private investigator J. J. Jake Gittes to survey her husband, Hollis Mulwray, chief engineer for the Los Angeles Department of Water and Power. Gittes tails him, hears him publicly oppose the creation of a new reservoir, and shoots photographs of him with a young woman, which are published on the front page of the following days paper. Back at his office, Gittes is confronted by a woman who informs him she is the real Evelyn Mulwray, and that he can expect a lawsuit.Realizing he was set up, Gittes assumes that Mulwrays husband is the real target. Before he can question him, Lieutenant Lou Escobar fishes Mulwray, drowned, from a freshwater reservoir. Under retainer to Mrs. Mulwray, Gittes investigates his suspicions of murder and notices that, although huge quantities of water are released from the reservoir every night, the land is almost dry. Gittes is warned off by Water Department Security Chief Claude Mulvihill and a henchman, who slashes Gittess nose. Back at his office, Gittes receives a call from Ida Sessions, who identifies herself as the imposter Mrs. Mulwray. She is afraid to identify her employer, but tells Gittes to check the days obituaries. ........
Source: Wikipedia