Geronimo's adventurous sister Thea is taking the publishing world by storm in this fabumouse tale packed with action, mystery, and friendship.In this exciting adventure, the Thea Sisters are off to Japan on a cultural exchange program. While they're busy exploring Kyoto and admiring the beautiful cherry blossoms, a valuable doll is stolen from a wealthy Japanese collector. Will the five mice be able to track down the doll and catch the thief? Readers...

Geronimo's adventurous sister Thea narrates this tale packed with action, mystery, and friendship!In this fabumouse adventure, the Thea Sisters head to Alaska, where they're attending a conference held by an important ecological association. Their host and his family are native Alaskans who show the mouselings their favorite games and activities. But soon there's trouble—the Thea Sisters discover that someone is upsetting the ecosystem by blowing...

Geronimo's adventurous sister Thea narrates this fabulous adventure that's packed with action, mystery, and friendship!In this exciting adventure, the Thea Sisters are off to Paris to visit Colette's fashion-designer friend Julie. But when Julie's designs are suddenly stolen, the girls must search the city of Paris to catch the thief and save the fashion show. Readers will love following the clues to help the Thea Sisters solve the mystery!

Geronimo's adventurous sister Thea narrates this fabulous adventure that's packed with action, mystery, and friendship!The Thea Sisters are boarding the famouse Orient Express for a journey from Paris to Istanbul! The train is on a special trip to return a precious wedding dress stolen years ago from an Istanbul museum. But there's a rumor that the mysterious Acrobat Thief will steal the dress from the moving train! The Thea Sisters are determined...

It's election time at Mouseford Academy, and the candidates from the Lizard and Gecko student clubs have to win several competitions if they want to become class president. But during the competitions, something mysterious tries to pollute the island's beaches! The fate of the election and their beautiful island home is at stake!

Join Thea Stilton and the Thea Sisters on this adventure packed with mystery and friendship!

The Thea Sisters are in Kenya on a photo safari! The mouselets love exploring the magnificent landscape and learning about the animals on the reserve they're visiting. A lion cub has just been born — but while they're there, he's kidnapped! It's up to the Thea Sisters to rescue him in an adventure across the savanna.

The Thea Sisters are visiting friends in Spain when a mysterious theft turns their trip into an investigation! They end up hot on the trail of a secret treasure. The mouselets are in for an incredible adventure full of flamenco dance!

A magical world is in danger! The Thea Sisters are on their way. . . .

Thea Stilton and the Thea Sisters are on an expedition to the fantastical Land of Erin. While they are searching for a missing friend, they learn that the land itself is in peril! The mouselets are ready to help.On their journey, they encounter fairies, pixies, and other magical creatures — some helpful, but some out to trick them! Can the Thea Sisters save the Land...

Thea Stilton and her sisters journey to the land of Minwa, a realm linked to the legends of Japan and wrapped in mysteries and enchantments, to discover why the realm's special lotus flowers are disappearing--and why their diappearance seems to be threatening the whole land.

Join Thea Stilton and the Thea Sisters on an adventure packed with mystery and friendship!

While Violet is taking an art class in the Netherlands, her friend's father suddenly disappears! The missing mouse is a renowned botanist — and his disappearance is linked to the mysterious black tulip. The Thea Sisters are eager to help find him. It's an adventure through the flowers gardens and canals of Holland!