Geronimo Stilton Heromice #8: Charge of the Clones

Super Swiss slices! The Heromice have just locked Sewer Rat Tony Sludge and his henchmice in jail when the unthinkable happens - they commit another crime across town! What in the name of cheese is going on? It seems an army of criminal clones is taking over Muskrat City, and only the Heromice can stop it!