Real estate developer Jake Berman hires private investigator and war veteran Jake Gittes for some run-of-the-mill matrimonial work. After Berman shoots his wife's lover, who happens to be his business partner, Gittes is drawn into a web of conspiracy and deceit involving the oil reserves beneath Los Angeles. While investigating, Gittes hears a voice from his past that causes him to revisit a traumatic case in Chinatown.

Hector is a star basketball player for the College basketball team he plays for, the Leopards. His girlfriend, Olive, doesn't know whether to stay with him or leave him. And his friend, Gabriel, who may have dropped out from school and become a protestor, wants desperately not to get drafted for Vietnam.