Harry Mills is a guardian angel on a mission: help 24-year-old Addie Folsom get her life back on track and help her find love. Posing as a teacher at a local college, Harry is up to the task, but not even he can predict the surprises that lay in store when Addie and her polar-opposite next-door neighbor, Erich, are forced to spend Christmas together. However, Addie and Erich soon find they have more in common than they thought --- and that two people who seem so wrong for each other may actually be just right.