Do you know what Christmas truly is? You're about to find out. It's Christmas Eve and George and Georgina are curious about the true meaning of Christmas. What is it? Why do we celebrate it? And why do we give and receive presents? So Granny tells them her final story. A long time ago, Mary, Maz and Chris - three sisters from West Pudding - climbed the Sky Tree and encountered the Lady of the Skies, a magical creature harbouring a sad secret. Her...