Bored with her life, 12-year-old Claudia Kincaid is ready for a big change. In fact, she wants to run away from home. She takes Jamie, the second youngest of her three brothers — the quiet one with the largest cache of money — with her to the Metropolitan Museum of Art in New York City. Their vacation from "real" life turns into an adventure when Angel, a sculpture rumored to have been carved by Michelangelo, arrives. Will they solve a mystery that even the experts can't solve?