October 1943: Lt. Commander Jack Tremain returns to the Pacific theater. He's recovered from his wounds, but not from the loss of his wife. Plunging back into sea duty, he takes on a new sub and a new mission-to intercept a Japanese tanker convoy. But when Tremain spots the Shigure-the Japanese destroyer that sank his beloved first command, the Seatrout-he declares his own personal war on the dreaded ship known as the "Submarine Killer." As he relentlessly pursues the enemy warship through raging storms and dangerous waters, nothing can stop Tremain's hell-bent obsession with sinking the Shigure-at any cost…