A rich brother and sister are crazed killers. She lures men into her bed, and he attacks them and murders them. A detective is assigned to find the killers and bring them in.

Almost the whole staff of a tax consultant office are slain by a team of professional killers, only Paul Damone can escape. He didn't know that his partner used to wash gangster Louis Sarazin's money and had to testify as chief witness against him. Paul's brother Johnny, best bounty tracker of Boston, visits Paul to protect him, but can't prevent that he and his pregnant wife are targeted by the same team. Now Johnny's out for revenge...

An undercover cop teams up with a martial-arts expert to stop a gang of drug smugglers and car thieves.