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.

Original title: Il superttacco delle margherite zannute.