Thea Stilton, Geronimo's sister, is invited to teach a journalism class at prestigous Mouseford Academy and she and five amazing students solve the mystery of a student that disappeared.

While five little mice at Mouseford Academy are looking for their missing biology professor they dive to a haunted shipwreck off Whale Island to find a rare diamond that was lost when the ship sank.

"When Colette invites her friends to come home with her to Paris for spring break, the five mice are delighted. While they're in France, they'll even get to attend Colette's fashion-designer cousin Julie's runway show at the Eiffel Tower! But soon after the Thea Sisters arrive, Julie's designs are stolen. Will the five mice be able to catch the thief in time to save the fashion show?"--P. [4] of cover.

The mouselings are headed on a fabumouse mission-- to the moon! After much preparation, the mice blast off. But when they arrive at their lunar vacation spot, things start to go wrong, including spaceship wrecks and rebellious robots. Can the Thea sisters save the day?

"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 up the ice with explosives! Can the Thea Sisters figure out what's going on and save the day?"...

"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 gown from the moving train! The Thea Sisters are determined to foil this sneaky mouse's plans" -- p. [4] of cover.

"The Thea Sisters are in Hawaii to compete in an international hula festival. The mouselets are having a great time -- until they learn that the festival is located on the side of a volcano that is about to erupt! No one else seems know about the danger. The Thea Sisters don't have any time to lose!"--P. [4] of cover.

A lion cub is kidnapped while the Thea Sisters visit a Kenyan safari, and they must travel across the savanna to rescue him.

It is up to the Thea sisters to investigate when an Ecuadorian chocolate factory known for its environmental practices begins malfunctioning and the owner suspects sabotage.

It is up to the Thea sisters to investigate when their friend is falsely accused of theft and barred from competing in a figure skating championship in Russia.

While visiting a movie set in Hollywood, the Thea sisters set out in search of a thief who has stolen an important reel of film from the studio.

When one of the Thea Sisters' favorite mystery writers goes missing, the five mice travel to the author's native Iceland, where they reconstruct the dangerous plot of his latest novel in the icy terrain to piece together clues.