Murphy is the only member of his crew to have survived the slaughter that was inflicted upon them by a German U-Boat in the latter days of World War II. After being rescued, he travels to an abandoned mission station close to the mouth of the Orinoco River, where he starts formulating a plan for exacting revenge. He has the audacious goal of sinking the U-Boat using whatever strategy that comes to his mind, and he prepares himself to undertake the effort while receiving assistance from Louis, the administrator of the local oil company.