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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! BONUS! After the story, read an extra Mini Mystery adventure and jokes galore!
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About the Author

Geronimo Stilton is the publisher of The Rodent's Gazette, Mouse Island's most famouse newspaper. In his spare time, Mr. Stilton enjoys collecting antique cheese rinds, playing golf, and telling stories to his nephew Benjamin. He lives in New Mouse City, Mouse Island. Visit Geronimo online at www.scholastic.com/geronimostilton.

Reviews

Praise for Geronimo Stilton books: "Lightning pace and full-color design will hook kids in a flash." - Publishers Weekly

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