On a stormy night, Robin's shiny little egg wobbles and falls off the branch of a tall tree. Eventually, the lucky bird finds her way into the humble but safe burrow of compassionate Dad Mouse, and little by little, Robin learns the ropes and becomes one of the family. However, try as she might, Robin will never be as good as her mouse-brothers. So, to prove her worth, optimistic Robin makes a wish upon a Christmas star, and off she goes on the adventure of a lifetime in unknown, peril-laden territories. But will Robin, the feathery mouse, ever realise that birds can fly?