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Based on an original idea by Elisabetta Dami Summary: The jewelers of Muskrat City are in trouble. A thief has been stealing precious diamonds, and the thief is...invisible! Can Heromice protect Duchess Marilyn Mousekovia and her precious star-studded gemstone during her visit to Muskrat City? And more important, will they catch the elusive thief?
Translated from the Italian Geronimo Stilton Heromice 5 Heromice 5