Late one Christmas Eve, Wall Street investment banker Jack Campbell (Nicolas Cage) is on his way home when he helps resolve a potentially violent incident in his local food store. His kindness is repaid the following morning, Christmas Day, when he wakes up not in his luxury bachelor pad, but in a New Jersey family home where he is the father of two bouncing kids and the husband of his college sweetheart Kate (Téa Leoni). Jack and Kate separated thirteen years ago, when he left her behind to pursue his banking career in London, and he is now being given a 24-hour glimpse of how his life would have turned out if he had married her instead. But maybe this gift isn't entirely welcome?