Diego daydreams of being a wizard with magical powers. He imagines using these powers to make the world a better place, and in particular to fight global warming. But when he snaps out of his daydreaming and remembers that he can't really do magic, he wonders whether there is anything he can do in real life to help save the world. As the book draws to a close, he walks past a mirror--and in the reflection, he sees that he has become a wizard after all.