About the Book: Geronimo Stilton (Set of 20 Books) When youre with Geronimo Stilton, its always a fabumouse adventure! Who is Geronimo Stilton? Thats me! I run a newspaper, but My true passion is writing tales of adventure. Here on mouse island, My books are all Best-sellers! Whats that? Youve never read one? Well, My books are full of fun. They are whisker-licking good stories, and thats a promise!.