y! is a richly illustrated picture book for children ages 4 to 10. In the book, Mrs. Barker wants to take her third-grade class to the library. When her student Alyssa objects, Mrs. Barker whispers to her, "There are dinosaurs in the library." Boy, are Alyssa and the rest of the class surprised (and a little frightened) when the library transforms into a Jurassic playground.