Geronimo Stilton lives in New Mouse City on Mouse Island with his friends and relatives. He works at The Rodent's Gazette, the most famous newspaper in New Mouse City. In these comics, Geronimo Stilton travels back in time to save the future, by protecting the past from his arch nemeses, the Pirate Cats. These devious felines plan to change history to make them supreme rulers of Mouse Island! Geronimo and Friends chase the dastardly Pirate Cats to the Ice Age and then hobnob with the likes of Marco Polo and Leonardo Da Vinci, while working on his famous Mona Lisa!