The film opens up with home videos of a husband and wife at the beach with their young son. A young man reads a short story about a boy and girl; saying that they didn't know it, but their lives would one day irrevocably change. Bill (Michael Sheen) and Kate (Maria Bello) are a married couple who are tightly wound and devoted to their work. Bill is a businessman, and Kate proofreads books for a living. The only thing keeping them together is their eighteen-year-old son Sam (Kyle Gallner), who is having trouble adjusting to college.