Geronimo has to make sure he doesn't sleep on the job when dealing with his next case! Geronimo Stilton, crusading news reporter and editor of The Rodent's Gazette, has been working too much and is in desperate need of a break. He is getting sleepy, very sleepy, but he can't actually fall asleep. Geronimo's cousin Trap tells him about a specialist, the Great Ratswami, who hypnotizes mice to help them relax. Shortly after Geronimo's meeting with the hypnotist, New Mouse City is plagued by a crime wave and Geronimo seems even more tired than ever! Something weird is going in New Mouse City, and the totally shocking answer will become front-page news!