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.

Geronimo and his crew explore the underwater planet of Aquarix, where they face fur-eating seaweed, ferocious piranha aliens, and pirate spacecats.

When their cousin is stung by a cavefly and falls into a deep sleep, Geronimo and Thea set out in search of the rare pink stinkrose, whose petals are thought to provide a cure.

In Milan to attend the unveiling of a parchment that contains the original recipe for a traditional holiday bread, Geronimo Stilton is shocked when a thief posing as him steals the recipe, forcing him to catch the culprit and clear his name.

While attending a two-day outdoor survival skills course, the Thea sisters and the Ruby Crew are caught in a terrible storm.

Space mouse Geronimo Stiltonix and his crew must save their friends who are stranded on the ice planet Polarix, home to colorful fuzz ball-shaped aliens who are not as harmless as they look.

Rushing to India to assist their friend Ashvin, the Thea Sisters learn of his efforts to return captive monkeys to their natural jungle environment and that someone has trained the monkeys to become jewel thieves.

Agatha Mistery and her cousin travel to Venice to investigate the theft of an ancient crown during the Carnevale celebrations.

When the Thea Sisters compete in a battle of the bands, in hopes of meeting their favorite band Top Direction, they must find their sound, write a song, and identify the saboteur who is trying to ruin their performance.

The Thea Sisters are summoned to the Seven Roses Unit by Will Mystery, but when they get there Will is missing; the sisters follow a trail of clues to the Fantasy Kingdoms, and find out that the Mayhem Mirror has been disturbed, and a terrible curse is about to be unleashed on the Fantasy Kingdoms, and it will be up to them to find the eight Harmonies which can break the curse and save the Kingdoms.