Paula, a photographer, is found brutally bludgeoned to death, and some of her expensive jewelry is missing as well. Sam notices a picture in Paula's developing tray and recognizes it as that of Joey Cahill. He was romantically involved with Joey's older sister Vicki years before and gave Joey a break on an assault rap. Paying a visit to Vicki, Sam discovers that she knows that Joey has issues controlling his violent nature and that she blames herself, thinking that she caused him to fall and suffer a severe head injury as a child. Sam is convinced that Joey is naturally a bad person and that he will hurt others, which he does when he attacks a female fence who refuses to handle the stolen jewels, and he also hits his own sister as well.