The Amazing Maurice and His Educated Rodents by Terry Pratchett

This book is the first young adult entry in the Discworld series, and the first with chapters. It starts at the Unseen University when a group of rats (and through the rats, a cat) eat something discarded by the wizards and find they can think and talk. Maurice develops a scam in which he uses the rats and a dopey-looking boy with a pipe to make money on unsuspecting towns. But when they arrive in a mysterious town in the Überwald, they find that the joke may be on them! The book was well-plotted and engaging throughout. I really enjoyed it.