Geronimo Stilton is the top reporter at the newspaper The Rodent's Echo, but he has a major rival, Sally Ratmousen, who is the editor-in-chief at Rodent Gazette. One afternoon, however, she mysteriously disappears. Rumors say she was kidnapped by the fearsome and terrible Barry Moustakis: the criminal who was imprisoned after Geronimo's report and was released just a few days ago! Geronimo Stilton wants to help Sally, but he fears it is yet another scheme she has set up to win a front-page headline. Will Geronimo succeed once again, or will he become cheese-bait for Moustakis?