Greyhound is a 2020 American war film directed by Aaron Schneider and starring Tom Hanks, who also wrote the screenplay. Based on C.S. Forester's 1955 novel The Good Shepherd, the film chronicles a U.S. Navy commander's first mission leading a multinational escort destroyer group during the Battle of the Atlantic. Tasked with protecting an Allied convoy from relentless U-boat attacks, Commander Ernest Krause, portrayed by Hanks, navigates the treacherous waters of the "Black Pit," a perilous stretch devoid of air cover. The movie also features Stephen Graham, Rob Morgan, and Elisabeth Shue.