Once they arrive, they spend their days in the museum, exploring and eavesdropping on different schools' guided tours. They hide in the bathrooms until after closing time and sleep in antique beds. While there they encounter "The Angel," a marble statue recently auctioned off by the elusive Mrs. Basil E. Frankweiler. The striking piece is surrounded by mystery. Many experts dispute the artist who created the work, but many suppose it to be none other than Michelangelo. Claudia becomes determined to solve the mystery of "The Angel." Claudia and Jamie spend most of their time in searching and researching new things about the statue.