Geronimo Stilton: The Enormouse Pearl Heist by Geronimo Stilton (author) (US edition)

Holey Cheese! When Geronimo, Bugsy, Benjamin and Petunia find a huge clam, they are shocked to find a mouse-ive pearl on the inside! Geronimo is so amazed, he simply has to write about it in The Rodent’s Gazette. However, the attention that the mouse detective’s discovery receives is not all good. It isn’t long before Geronimo and co are doing everything they can to protect the enormouse and fabulously rare pearl from being stolen by some of the worst criminals New Mouse City has ever seen!