One Christmas Eve, Father Christmas returns home after a hard evening's present delivering. Having put his reindeer to bed, he is just about to go to sleep himself, when he makes a distressing discovery: there is still one present left in his sack. It is for Harvey Slumfenberger, a poor boy whom Father Christmas knows only ever gets one present - the one that Father Christmas brings him. So, tired as he is, Father Christmas sets out alone for Harvey Slumfenberger's home far, far away on top of the Roly Poly Mountain. But will he get there on time?