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Geronimo unlocks the mystery in this fabumouse adventure! My sister, Thea, had discovered an enormouse old castle built by the founder of New Mouse City! She and Trap dragged me along with them to explore it. Inside, we found one hundred keys but only ninety-nine doors to unlock. What mysterious room did the hundredth key open? It was up to us to find it and reveal its secrets!

Geronimo Stilton, adventuremouse? Not me! But surely a little skiing couldn't hurt a rodent, right? Wrong. Moldy mozzarella! When my ski trip landed me in the hospital, I was sure it was going to be the worst Christmas ever! But my family and friends had something else in mind. . . .