GREYHOUND is a war movie starring Tom Hanks as Ernest Krause, the first-time American captain of a lead battleship destroyer protecting a convoy of merchant ships and troop ships heading for England in February 1942 during World War II. For 50 hours, in the middle of the Atlantic Ocean, the convoy is without an air escort until it gets closer to England. As soon as the air cover stops, the convoy faces a “wolf pack” of seven German submarines. The German subs repeatedly attack.