The number-one-bestselling, magical first children's novel from Tom Fletcher. This is a story about a boy named William Trundle and a dinosaur named the Christmasaurus. It's about how they meet one Christmas Eve and have a magical adventure. It's about friendship and families, sleigh bells and Santa, singing elves and flying reindeer. It's about discovering your heart's true desire, and learning that the impossible might just be possible . . .