In this wordless story, a young girl and her grandmother view works inside the Metropolitan Museum of Art, while the balloon she has been forced to leave outside floats around New York City causing a series of mishaps that mirror scenes in the museum's artworks.

Join William the hippo and friends in an interactive adventure puzzle book. Help them solve the mystery and save the exhibition! William the hippo and his friends live on 5th Avenue, New York, inside the Metropolitan Museum of Art. At night, when the museum is closed and all the visitors have gone home, their adventures begin. A special exhibition is about to open, and everyone is excited to see the amazing exhibits from all over the world. However,...