In the early 1960s the Cia made several attempts to kill Fidel Castro. Shortly afterwards John F. Kennedy was assassinated. Was the Cuban Government responsible for the retaliation? Was there a man on the grassy knoll? Wealthy shipping magnate Brydon Wilcox thinks so. Traveling to Dead Men's Isle and the home of the Sea Demons he asks Rick Chambers to sneak into Cuba and extract the man believed to have assassinated a sitting American President. The group accepts the mission and is soon slipping into Cuba only to find themselves drawn into the middle of a revolution. After witnessing wanton killings and rape in the village they join forces to defend the village and take down the fortress that hides their quarry.