Build a movie plot around this: Who learns that Mulwray was once the business partner of Noah Cross? Gittes
The answer to this question is:
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.Realizing he was set up, Gittes assumes that Mulwray's 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 Gittes's 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 day's obituaries.Gittes learns that Mulwray was once the business partner of his wife's wealthy father, Noah Cross. Over lunch at his personal club, Cross warns Gittes that he does not understand the forces at work, and offers to double Gittes's fee to search for Mulwray's missing mistress. At the hall of records, Gittes discovers that much of the Northwest Valley has changed ownership. Investigating the valley, he is attacked by angry landowners, who believe he is an agent of the water department attempting to force them out by sabotaging their water supply.Gittes deduces that the water department is drying the land so it can be bought at a reduced price, and that Mulwray was murdered when he discovered the plan. He discovers that a former retirement home resident is one of the valley's new landowners, and...