Nothing is impossible for Geronimo Superstilton! He helps watch over Muskrat City, ready to fight evil at all costs. He is strong, he is invincible, he is fearless! He is one of the Heromice!

Mice to the rescue

Now that the terrible Tony Sludge has escaped from prison, it's up to Geronimo Superstilton and the Heromice to defend Muskrat City from the notorious Sewer Rats and stop an enormouse blackout! Will our heroes be able to defeat their enemies without risking their fur?

From the book

"One dreary evening, I was relaxing in my cozy pawchair when I got a phone call from Uncle Stingysnout. He needed to see me! I headed straight to Pennypincher Castle for what I thought would be a nice weekend away, but I ended up having to single-handedly renovate the entire castle. Moldy mozzarella, what a crazy vacation!"