Focus Features has released a brand new trailer for Joe Wright's upcoming romantic drama Atonement.

On a hot summer day in 1935, thirteen-year-old Briony Tallis witnesses a moment's flirtation between her older sister, Cecilia, and Robbie Turner (James McAvoy), the son of a servant and Cecilia's childhood friend. But Briony's incomplete grasp of adult motives-together with her precocious literary gifts-brings about a crime that will change all their lives.

The filmmakers of Pride & Prejudice reunite for a new movie, based on the award-winning best-selling 2002 novel Atonement, which is a classic British romance that spans several decades. Fledgling writer Briony Tallis, as a 13-year-old, irrevocably changes the course of several lives when she accuses her older sister's (Pride & Prejudice Academy Award nominee Keira Knightley) lover (James McAvoy) of a crime he did not commit.

Atonement opens on December 7th, 2007.