Geronimo Stiltonix takes MouseStar 1's broken computer to a distant planet to be repaired by a brilliant inventor, but pirate spacecats attack and steal the device, and the spacemice must retrieve it before the machine can be turned against them.

Drawn once again into the Kingdom of Fantasy, Geronimo discovers that the Land of Books is being threatened by a wave of grayness spreading from the Kingdom of Swamp Valley rotting books and turning all the characters gray, sad and worried--and it will be up to Geronimo, Winglet (daughter of Blossom and newly crowned empress), and the intrepid characters from fiction who join them along the way, to locate the source of this new evil and put a stop...

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.

Geronimo, broken-hearted after a failed romance, sets out with his family to explore the Eighth Wonder of the Mouse World.

Geronimo Stilton, which was originally written in Italian, is a tale about a talking mouse that lives in New Mouse City on Mouse Island, where he works as a journalist for The Rodent's Gazette.

Phantom of the subway: When he hears reports of a ghost haunting New Mouse City's subway tunnels, Geronimo sets out to investigate. Temple of the Ruby of Fire: Geronimo, Thea, Trap, Benjamin and Geronimo race against time to find the legendary Ruby of Fire before it falls into the wrong paws.

Geronimo Stilton's ancestor, Geronimo Stiltonoot, investigates a witness's claim of a moving mountain of ice.

Even though Geronimo Stilton isn't exactly known for taking risks, he can't always say no to adventure -- especially when he's invited to be the first time-traveling mouse! But Geronimo's invitation does come with a catch. Professor Paws von Volt doesn't just want him to observe the past; Geronimo must investigate what caused the dinosaur extinction. Will Geronimo solve one of history's greatest mysteries, or will this time-traveling mouse end up...

It's the season for the annual cavemouse sports competition! This year, Tiger Khan and his saber-toothed henchmen want to enter the games. They call a truce with the cavemice during the tournament . . . but when their flag goes missing, Tiger Khan is furious. Can Geronimo Stiltonoot track it down in time to keep his fur intact?

The Seven Roses, magical flowers which bloom forever and which are linked to the health of the Land of Flowers, are dying, and the Thea sisters together with Will Mystery must travel to that land to discover the reason--a journey where every flower seems determined to hinder their passage.