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"Based on an original idea by Elisabetta Dami"--Copyright page.

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The Thea Sisters are invited to the Festival of Time in Germany! They arrive in the Black Forest and find that a famouse clock has been stolen. The mouselets are on the case. Can they find the thief and return the clock before time runs out

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Join Thea Stilton and the Thea Sisters on an adventure to find the seven secret treasures! The search for the seven secret treasures continues. In this incredible adventure the Thea Sisters come across the legendary Jewel of the Queen. They cross rivers of ice, deserts of fire, and other fascinating places on their journey to find it.

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The Thea Sisters are on a new adventure. It all begins when they find a diary belonging to an old explorer. It tells the legend of seven mysterious treasures. The girls find themselves on a search for the first treasure: the mythical Ivory Garden.

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The Kingdom of Starlight is in trouble! The shine from all the stars is fading. It is up to the Thea Sisters to figure out why. Can they return the light to the night sky before its too late

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Thea Stilton and the Thea Sisters are on an expedition to the fantastical Land of Erin! While searching for a missing mouse, they learn that the land is in peril. On their journey, the mouselets encounter fairies, pixies, gnomes, and other magical creatures. Can they complete their mission and save the Land of Erin before it's too late

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The Thea Sisters visit a friend in Ecuador who runs a chocolate factory that's 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 the mystery. Illustrations.

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The Thea Sisters are visiting a friend in sunny Californiaand she invites them to the set of a movie in Hollywood! The mice love being around fa-mouse and fabu-mouse 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

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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.

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The Thea Sisters are taking a trip to Canada! They have been invited to do some bird-watching with a group of friends. The girls are enjoying learning more about Canada and their love for hockey. But during their trip, one of their group members mysteriously disappears. They set off to Niagara Falls to find him. Can they solve the mystery

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The Thea sisters continue the search for the seven ancient treasures, using the clues found in Aurora Beatrix Lane's travel diary to find a fabulous emerald which once belonged to Cleopatra--a quest that leads them from Moscow to the Sahara and finally Bolivia.

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The Thea Sisters are summoned to the Seven Roses Unit by Will Mystery, but when they get there Will is missing! The sisters must follow a trail of clues to the Fantasy Kingdoms on their quest to find Will.

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Translation of: Caccia al tesoro a Roma.

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The Thea Sisters receive a call from Will Mystery, who informs them that, once again, there is trouble in one of the imaginary kingdoms! A crack has been discovered in one of the maps in the Hall of Roses. The girls head to the Crystal Kingdom to help uncover the mystery.

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Thea Stilton and Thea Sisters are called to help to an enchanted landNa world linked to the legends of Japan. The realm's special lotus flowers are disappearing, and no one knows why. The mouselets must discover the secret of the lotus flowers to solve the mystery, but can they trust the strange magical creatures that they meet on their way Illustrations.

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Translation of: Il segreto delle fate degli oceani. Segrate, Italy: Edizioni Piemme S.p.A., A2015.

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The Thea Sisters are in Hawaii to compete in an international hula festival. The mouselets are having a great timeNuntil they learn that the festival is located on the side of a volcano that is about to erupt! The Thea Sisters don't have any time to lose! Illustrations.

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Violet has been chosen to play in the orchestra for a production of Romeo and Juliet in London! The mouselets begin to notice strange things happening during rehearsals. Someone is trying to sabotage the production. Can the Sisters uncover the phantom before the show is ruined

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Thea Stilton--the attributed author--is a book character who's the younger sister of Geronimo Stilton, the fictional author of a related series.