Geronimo Stilton Heromice #5: Invisible Thief

Suitable for:

Age Level: 7 - 12

Lexile Measure: 600L

The jewelers of Muskrat City are in trouble. A thief has been stealing precious diamonds, and the thief is & invisible! Can the Heromice protect Duchess Marilyn Mousekovia and her precious gemstone during her visit to Muskrat City? And more importantly, will they catch the elusive Invisible Thief?