#4 Heromice: The Perilous Plants - Paperback | Geronimo Stilton
Format: Paperback 3
The Sewer Rats have created a breed of superplants that are taking over Muskrat City! And what's worse, they've captured Lady Wonderwhiskers and are holding her prisoner. It's up to Superstilton and Swift paws to save her - and figure out who she really is when she's not a crime-fighting Hermouse!