One Christmas season, the citizens of a small town, both human and mouse, find their letters to Santa Claus have been unceremoniously returned. Furthermore, there is a message that says the entire town has been removed from Santa's delivery itinerary due to being insulted by a letter from that town dismissing his existance. While Father Mouse confronts his cynical son, Albert, who wrote the letter; their human companions, a clockmaker and his family work to find a way to regain Mr. Claus' favour.