Despite her family's objections, Tracy gets ready to go and spend Christmas at Peter's. As she's about to set off, she remembers she's left a bag in the house. Since Amy's already settled, Tracy locks her in the car and quickly nips inside to get her things . . . Meanwhile, after arguing with Steve, Karen walks out and when she sees Tracy abandon the car on the street, she can't help taking it for a spin . . . When Tracy comes outside moments later, the car and Amy have gone!
