A woman identifying herself as Evelyn Mulwray hires private investigator J. J. "Jake" Gittes to surveil 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 day's 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.