While on a spy mission in the Brtitish dominated Caribbean, the young commander of German submarine U-329, from a base in German-occupied Norway, learns by radio from headquarters that Japan has bombed Pearl Harbor in Hawaii, and Germany has declared war on the United States. Off Aruba, he is ordered to proceed to a small island off the Yucatan for re fueling. There he gets orders to go into US Gulf waters and meet an agent who will direct him to a US target. The captain believes the target, not yet disclosed to him for reasons of secrecy, will be so critical that its destruction will...