"Atonement" is a 2007 period drama film directed by Joe Wright. The film is based on the novel of the same name by Ian McEwan. It stars Keira Knightley, James McAvoy, Saoirse Ronan, Romola Garai, and Vanessa Redgrave. The story revolves around the consequences of a lie told by a young girl, Briony, which affects the lives of her sister and her lover.