Something's not right. Geronimo Stilton, the hard-working editor-in-chief of the Rodent's Gazette isn't himself lately. It seems that whatever there's important work for Geronimo to do ... he suddenly starts sneezing or falls asleep. That's no way to run a major important newspaper, especially when there's a crime spree taking place in New Mouse City! Could it be that Geronimo has developed an allergy to work? Is such a thing even possible? Geronimo's family notices what's happening and his cousin Trap presents him with a coupon to a famous hypnotist, the (once) great Ratswami, hoping that will cure him. Will Ratswami solve Geronimo's problem ... or is there something far more dangerous going on?