From the Mixed-Up Files of Mrs. Basil E. Frankweiler

After reading this book, I guarantee that you will never visit the Metropolitan Museum of Art (or any wonderful, old cavern of a museum) without sneaking into the bathrooms to look for Claudia and her brother Jamie. They’re standing on the toilets, still, hiding until the museum closes and their adventure begins. Such is the impact of timeless novels . . . they never leave us.
E. L. Konigsburg won the 1967 Newbery Medal for this tale of how Claudia and her brother run away to the museum in order to teach their parents a lesson. Little do they know that mystery awaits!