Whose car is the person from the convenience store driving?
Jack and Kate, who have been together since college, are at JFK Airport, where Jack is about to leave to take up a twelve-month internship with Barclays in London. Kate fears the separation will be fatal for their relationship and asks him not to go, but he reassures her, saying their love is strong enough to last, and he flies out.
The scene fades out to "13 years later": Jack is now an unmarried Wall Street executive in New York City, living a carefree bachelor's life. At work, he is putting together a multi-billion dollar merger and has ordered an emergency meeting on Christmas Day. In his office, on Christmas Eve, he gets a message to contact Kate, but, even though he remembers her, he dismisses it, apparently uninterested. 
On his way home, he is in a convenience store when a young man, Cash, enters claiming to have a winning lottery ticket worth $238, but the store clerk refuses him, saying the ticket is a forgery. Cash pulls out a gun and threatens him, so Jack offers to buy the ticket and Cash eventually agrees. Outside, Jack tries to help Cash, to which he responds by asking Jack if anything is missing from his life. Jack says he has everything he needs, whereupon Cash enigmatically remarks that Jack has brought upon himself what is now going to happen, and walks away. A puzzled Jack returns to his penthouse and sleeps.
On Christmas Day, Jack wakes up in a suburban New Jersey bedroom with Kate and two children. He rushes out to his condo and office in New York, but both doormen refuse him entrance and do not recognize him. Jack runs out into the street and encounters Cash driving Jack's Ferrari. Although Cash offers to explain what is happening, all he says is  a vague reference to "The Organization" and that Jack is getting "a glimpse" which will help him to figure out for himself what it's about.
Jack's