Filmed on location in the U.K., the story of Atonement spans several decades. In 1935, 13-year-old fledgling writer Briony Tallis (Saoirse Ronan) and her family live a life of wealth and privilege in their enormous mansion. On the warmest day of the year, the country estate takes on an unsettling hothouse atmosphere, stoking Briony's vivid imagination. Robbie Turner (James McAvoy), the educated son of the family's housekeeper, carries a torch for Briony's headstrong older sister Cecilia (Keira Knightley). Cecilia, he hopes, has comparable feelings; all it will take is one spark for this relationship to combust.