Heromice: The Perilous Plants

"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 Swiftpaws to save her - and figure out who she really is when she's not a crime-fighting Heromouse!" --Back cover.