The Pirate Cats have traveled back to Milan, Italy in the year 1770, in order to steal one of the most important musical works in history: a symphony composed by a young Wolfgang Amadeus Mozart! It's up to Geronimo and his friends to go back in time and stop the Pirate Cats from their dastardly deed!

The popular children’s story appears in graphic novel form for the first time in the U.S., with stories never seen in America. Geronimo Stilton is a talking mouse who 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 this series of comics, Geronimo Stilton travels through time in order to defend history from his arch nemeses, the Pirate Cats. These devious felines plan to travel back in time in order to change history to make them supreme rulers of Mouse Island!

Geronimo Stilton, crusading news reporter and editor of The Rodent’s Gazette, has been working too much and is in desperate need of a break. He is getting sleepy, very sleepy, but he can’t actually fall asleep. Geronimo’s cousin Trap tells him about a specialist, the Great Ratswami, who hypnotizes mice to help them relax. Shortly after Geronimo’s meeting with the hypnotist, New Mouse City is plagued by a crime wave and Geronimo seems even more tired than ever! Something weird is going in New Mouse City, and the totally shocking answer will become front-page news!

The Pirate Cats travel to the 18th Century to do what they do best… be pirates! So they steal an old ship sailing on the Indian Ocean to pillage the East India Company's merchant ships! It's up to Geronimo Stilton to travel through time, become a sailor, and stop the cats from changing history forever! Will Geronimo get his sea legs in time to save the day?

Geronimo, Trap, Pandora, Benjamin and Patti return to the era of Louis XIII on the trail of the Pirate Cats. At Fontainebleu Castle they enroll in Richelieu's army of mousketeers and are commanded by the cardinal to oppose two brigands in the area. The mice discover that the brigands are no other than Cattardone and Tersilla who have replaced Louis XIII with Bonzo! Our heroes must find the real Louis XIII and and put him back on the throne.

Utah, USA, 1869. Work on the Transcontinental Railroad connecting the east and west coasts keeps suffering mysterious mousehaps. Can it be the dastardly work of Catardone and his band of Pirate Cats? In the unlikely role of deputy sheriff, Geronimo Stilton must once again save the future by protecting the past!

Athens, Greece: the first Olympic Games are about to take place, and the Pirate Cats have traveled back in time to enter the competition. The fiendish felines plan to win as many events as they can, and become legendary athletes. But these cats aren't exactly in playing shape! In order to gain an edge, they bring all sorts of modern-age sports gear to improve their odds of winning. It's up to Geronimo and the gang to foil their scheme and save history.