E. L Konigsburg

When suburban Claudia Kincaid decides to run away, she knows she doesn't just want to run "from" somewhere, she wants to run "to" somewhere -- to a place that is comfortable, beautiful, and, preferably, elegant. She chooses the Metropolitan Museum of Art in New York City. Knowing that her younger brother Jamie has money and thus can help her with a serious cash-flow problem, she invites him along. Once settled into the museum, Claudia and Jamie find...