Eleven-year-old Mattie Marvelwood comes from a family of traveling performers. Her dad is an illusionist; her mom is a fortune-teller; her brother has a vanishing act; and she herself is a mind-reader. But the Marvelwoods have a deep secret. The acts they perform at carnivals, fairs, and circuses are not just acts. Their powers are real. In all their wanderings, the Marvelwoods have never met another performer with gifts like theirs--until...