South Pacific, 1943. Commander Jack Tremain returns to the war zone after a long stint ashore. After narrowly surviving the Battle of Vella LaVella, he is given command of the Whitefin, one of the many American submarines based in Australia. Before long, he discovers that an old nemesis is plodding the seas of the patrol zones - the Japanese destroyer Shigure: the infamous submarine killer, the Scourge of The Solomons, and the ship responsible for sinking Tremain's first command. With a mysterious British commando aboard, and a secret mission that not even Tremain is privy to, the Whitefin sets out for the waters of the Philippine Islands and a final confrontation with the dreaded Japanese warship.