New York City girl Claudia, a mere month shy of being a twelve-year-old, has resolved to run away from home with her younger brother, Jamie. She knows that she could never pull off the classic spur-of-the-moment departure without a destination (inevitably involving having to eat outside with the insects, and cupcakes melting in the sun); so she plans everything to perfection, including their destination: the grand, elegant, beautiful, all-encompassing Metropolitan Museum of Art. However, no sooner have Claudia and Jamie settled into their new home, than they are caught up in the mystery of an...