Detective Dan McKenna's (Lamas) wife is killed by Frank Dallio (Dunn) during the criminal's escape from the FBI and he's shot in the face by Dallio's buddy Mason, who happens to be a ringer for McKenna and conveniently dies in a car crash. Since the FBI want Dallio, Agent Jeffries (Williams) persuades McKenna to pose as Mason, which he does in order to get revenge.