Book excerpt: Harper and her friends want to help the Wild Conductor win back his place in the magical Circus of Dreams. They put on a wondrous show, but their plan goes horribly wrong. Instead of the Wild Conductor, the ringmaster selects Harper to show off her incredible musical skills for the world to see. But once inside the circus, Harper learns of the Fire Star, a girl with her own extraordinary gift. She shines like a star whenever she hears music. And Harper may have figured out why . . .