A secret cargo is headed for Japan. The Japanese High Command has entrusted it to a veteran destroyer captain - the best in the Imperial Navy - and he will stop at nothing to see that it reaches its final destination... Carrier-based dive bombers could not stop it, nor could the guerilla-commandos of the Philippine Islands. Now, the submarine Wolffish is the last ditch hope of the Allied Command. Still shaken by a recent tragedy, and desperately low on fuel, torpedoes, and morale, the war-weary submarine and her eighty-man crew must pull together to track down and destroy the cargo before it reaches Japan, and changes the course of the war...