Geronimo Stilton is invited to a rat-jitsu martial arts championship in a snowy faraway land, much to the famouse reporter's surprise. With his helpful relatives, Thea, Trap and Benjamin, Geronimo goes to cover the event for the Rodent's Gazette. But something strange is happening. After each championship match, the winner disappears without a trace! Will Geronimo get involved and solve the mystery of the missing martial artists? Or will he be consumed with fear and race back to New Mouse City with his tail between his legs?

"Based on episode 9 of the Geronimo Stilton animated series "Il Gran Torneo dei Guerrieri Topitsu," ["Mask of the rat-jitsu"] written by Diane Morel, storyboard by Jean Texier"--Title page verso. Based on an original idea by Elisabetta Dami. Includes an excerpt from Geronimo Stilton, reporter graphic novel #10 Blackrat's treasure.