Geronimo Stilton Reporter Vol. 9 : The Mask of Rat Jit-su

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?