Sink or swim

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.