After masked attackers kill her sister and young nephew, a female psychologist takes the law into her own hands by acting as a defense witness by day and a ruthless avenger by night.

A serial killer, plagued by the memory of a fatal car accident, uses various tools to murder female tenants of a Los Angeles apartment complex, then abducts a teenaged girl who lives there with her family. When the police express doubt that the murders are connected to the girl's disappearance, her brother sets out to search for her on his own.