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Geronimo's adventurous sister, Thea, narrates this fabulous adventure that's packed with action, mystery, and friendship During a marine biology lesson at Mouseford Academy, the Thea Sisters learn about a mysterious shipwreck off Whale Island. According to legend, a very rare diamond called Jasmine's Heart was on the ship when it sank. When biology teacher Professor Van Kraken disappears, the Thea Sisters have to dive into the deep ocean to find him and the jewel. And just when they think their adventures are over, the Thea Sisters receive an invitation to travel to China to find another...

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. Full color.

Geronimo's adventurous sister Thea narrates this fabulous adventure that's packed with action, mystery, and friendship
The Thea Sisters are off to New York City for another fabumouse adventure Nicky has been training to run the Big Apple Marathon, and her friends are there to support her. While in the city, they all visit Pamela's family and have a delicious dinner at the family's pizzeria. But the mouselings discover that someone has been threatening to burn the restaurant down, and Pam's family might have to close it for good to stay safe Will the Thea Sisters catch the troublemaker...

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. Original.

Great news for the Mouseford Academy students Top Direction, one of the most popular bands for teenagers, is going to perform on Whale Island And they have decided that the opening act will be chosen among the best bands Mouseford Academy has to offer Students have two weeks to write a song, and then Top Direction will pick the winner. The Thea Sisters have to win, but someone is trying to sabotage their performance. The Sisters must work together to find their sound, write a great song, and put on the performance of their lives.

Join Thea Stilton and the Thea Sisters on an adventure packed with mystery and friendship
The Thea Sisters are visiting a friend in Ecuador who has a sweet job -- he runs a chocolate factory His factory is in the running for a major award for its environmental methods. But suddenly, chocolate production starts to malfunction. Is it sabotage? It's up to the Thea Sisters to solve this mouthwatering mystery

The Thea Sisters are visiting a friend in sunny California -- and she invites them to the set of a movie in Hollywood The mice love being around famouse and fabumouse directors and actors as they're working. But then an important reel of film is stolen from the studio Can the Thea Sisters catch the thief and save the movie?

To celebrate Mouse Academy's 600th anniversary, the headmaster and teachers decide to stage a performance of William Squeakspeare's play, "Mouseo & Juliet." The Thea Sisters all want the part of Juliet, but so does their rival, Ruby Flashyfur. Who will be the star of the show?