Geronimo Stilton, famouse news reporter and editor-in-chief of The Rodent's Gazette, is on the adventure of a lifetime! First, he finds an old treasure map in an envelope for a mysterious stranger. Geronimo and friends are off to find the treasure, so they can return it. Then, Geronimo is busy, busy, busy. He can't even sleep. Geronimo visits a specialist, the Great Ratswami - but now that Geronimo can snooze, there's crime all over New Mouse City and he's still so tired! Finally, it's time to get physical when Geronimo is invited to a rat-jitsu martial arts championship. But once again mystery abounds - the winners of the match keep disappearing! Will these cases make the front cover? Collecting three Geronimo Stilton Reporter Adventures based on the hit animated series!