Greyhound is a 2020 American war film directed by Aaron Schneider. It stars and was written by Tom Hanks. The film is based on the 1955 novel The Good Shepherd by C. S. Forester. It also stars Stephen Graham, Rob Morgan, and Elisabeth Shue.
The plot follows a US Navy Commander on his first war-time assignment in command of a multi-national escort group defending a merchant ship convoy under attack by submarines in early-1942 during the Battle of the Atlantic. The plot focuses on the multiple day transit of the "Black Pit." This is the Mid-Atlantic gap where they are out of range of protective air cover.