The next day, an anonymous call draws Gittes to Ida Sessions's apartment; he finds her murdered and Escobar waiting for his arrival. Escobar tells him the coroner's report found salt water in Mulwray's lungs, indicating that he did not drown in the freshwater reservoir. Escobar suspects Evelyn of the murder and tells Gittes to produce her quickly. At Evelyn's mansion, Gittes finds her servants packing her things. He realizes her garden pond is salt water and discovers a pair of bifocals in it. He confronts Evelyn about her "sister"; after Gittes slaps her, she admits that the woman, Katherine, is her sister and her daughter: her father raped her when she was fifteen. She says that the eyeglasses are not Mulwray's, as he did not wear bifocals.