"Atonement," directed by Joe Wright and based on Ian McEwan's novel of the same name, is a powerful exploration of guilt, redemption, and the destructive nature of unchecked emotions. The film tells the story of Briony Tallis (Saoirse Ronan), a young girl who, through a lie born of her own misinterpretation and ego, sets off a chain of events that irrevocably alters the lives of those around her, particularly her sister Cecilia (Keira Knightley) and Cecilia's lover, Robbie (James McAvoy).