'Twas the night before Christmas, when all through the house not a creature was stirring... except a lonely mouse who lives in the grandfather clock. So when Santa arrives, lost in a blizzard, Mouse is the only one who can save Christmas. Together they soar through the skies to deliver every present before Christmas Day dawns. But could the most special gift of all be for Mouse himself?

Believing that his new home is perfect, with just enough room for his things, Mouse becomes concerned about the growling sounds over by the piano, snapping noises in the bathtub and someone sliding down the bannister before the little house becomes full to bursting with animal friends.