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.