When a beautiful young woman suddenly offers inebriated Casey Morrow a lot of money for a quick and easy job, he doesn't ask too many questions. But when the girl's father is found murdered the following day and Morrow's coat is soaked with blood, he must unravel the mystery to clear his name.

Someone knocked out a man and left him for dead during a fishing trip in Portugal. That someone is either his fetching wife, or two business partners, all sporting guilty faces after his unexpected return. Two more murders and a frame-up befall the quartet before an inspector closes the case.