Mark Winger, a husband and father, catches a man in the act of bludgeoning his wife to death. Winger shoots and kills the man, and the ensuing investigation reveals the intruder was a psychotic cab driver, against whom the wife had filed a complaint after a harrowing drive with him a few days earlier. Police find that Winger had acted justifiably in the shooting. A few years later, Mark Winger files a civil suit against the cab company. Amazingly, this suit propels an aggressive and comprehensive investigation which results in his own arrest for the double murder.