When you're with Geronimo Stilton, it's always a fabulous mouse adventure! Who is Geronimo Stilton? That's me! I run a newspaper, but My true passion is writing tales of adventure. Here on mouse island, My books are all Best-sellers! What's that? You've never read one? Well, My books are full of fun. They are whisker-licking good stories, and that's a promise!.