The fishing trawler that had been sailing around the Falkland Islands looked innocent and was ignored by the authorities there. It was, however, actually a spy ship from nearby Argentina. When four inebriated islanders decided to sail out and harass the ship, what happened there is unknown but their dead bodies found the next day told a horrible story. Ben Sign is asked by British Intelligence to investigate. He is reluctant to do so until he learns there that been a fifth man in the group and he escaped the mayhem and was in hiding.