Holey cheese, it was strange! All across New Mouse City, rodents kept telling me I'd done things I had no memory of. Was I going crazy? Had the cheese finally slipped off my cracker? No, that wasn't it. I soon discovered the truth: There was a Geronimo lookalike going around, pretending to be me! He'd even fooled my sister Thea. Worst of all, he was trying to take over The Rodent's Gazette! I had to get that greedy impostor's paws off my newspaper,...

My sister, Thea, is the mystery-loving rodent, not me! But somehow I found myself going undercover to get to the bottom of a case. Slimy Swiss balls -- I hardly knew where to start! Geronimo Stilton, Secret Agent Mouse? Maybe I could get used to that. ...

Geronimo and his friend Hercule Poirat venture into the sewers to find the origin of the horrible stink that is driving all the mice away from New Mouse City--and learn an important lesson about recycling.

During the Super Cup soccer finals, Geronimo Stilton notices something suspicious happening on the field and must follow his hunch before his two favorite teams are cheated out of their trophies.

Trap was entering the Super Chef Contest, which determines the best cook on Mouse Island -- and he was bringing along as an assistant! Slimy Swiss cheese.

When Geromino Stilton and his friends time travel to three different centuries seeking artifacts missing from the mouseum, they meet Alexander the Great, Queen Cleopatra, Francis Drake, and Mozart.

Geronimo heads to Penny Pincher Castle for some much needed vacation time, but his uncle puts him to work instead.

When, in the process of testing his newest time machine, Professor von Volt accidently brings a triceratops, Helen of Troy, Attila the Hun, Charlemagne, and Christopher Columbus to present day New Mouse City, it is up to Geronimo and his friends to return them all to their own times and places--without being eaten by a T-Rex or skewered by Trojan warriors.