As the snow begins to fall just days before Christmas, Grandad helps Sara build an igloo in the garden and Sara sculpts a small polar bear to watch over it. What could be more exciting than sleeping outside under the stars?

But when Sara wakes in the middle of the night, she finds the igloo is no longer in the garden but lost in a world of ice … and her snow bear has transformed into a real live polar bear cub.

She sets out on an enchanted journey, but will she ever find her way home?