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Geronimo, Thea, and Trap are exploring a mysterious old castle built by the founder of New Mouse City! Can they unlock all its rooms and discover its secrets? EXTRA! EXTRA! Read an entire bonus Geronimo Stilton story after the main adventure: "The Double Cross." Can Geronimo catch a jewel thief while on vacation?
Geronimo, Thea, and Trap are exploring a mysterious old castle built by the founder of New Mouse City! Can they unlock all its rooms and discover its secrets? EXTRA! EXTRA! Read an entire bonus Geronimo Stilton story after the main adventure: "The Double Cross." Can Geronimo catch a jewel thief while on vacation?
