"The sea had become a mass grave by 1941 as Hitler's four capital warships--Scharnhorst, Gneisenau, Tirpitz, and Bismarck, the largest warship on the ocean--roamed the wind-swept waves, threatening the Allied war effort and sending thousands of men to the icy depths of the North Atlantic. Bristling with guns and steeled in heavy armor, these reapers of the sea could outrun and outgun any battleship in the Allied arsenal. The deadly menace kept Winston...

"The triumphant true story of the young women who helped to devise the winning strategy that defeated Nazi U-boats and delivered a decisive victory in the Battle of the Atlantic." -- From book jacket. "By 1941, Winston Churchill had come to believe that the outcome of World War II rested on the battle for the Atlantic. A grand strategy game was devised by Captain Gilbert Roberts and a group of ten Wrens (members of the Women's Royal Naval Service)...

In January 1942, twelve-year-old Colton is on his family's fishing boat in the Atlantic with his older brother Danny when the boat is capsized by a Nazi U-boat, and Danny is severely injured; realizing how close the enemy is, Colton takes his brother's enlistment papers and joins the Navy, determined to do his part to defeat Germany--if only he can keep his age a secret and survive life at sea.