Join Thea Stilton and the Thea Sisters on an adventure packed with mystery and friendship!The Thea Sisters spend the holidays in Rome!

After Violet is chosen to play in the orchestra for a London production of "Romeo and Juliet," Thea and her friends investigate acts of sabotage before the culprit can ruin the show.

Thea and her mouse girlfriends go to Venice for Carnival.

When Thea Stilton travels to Ireland to search for a missing agent, she finds that the whole fantasy Land of Erin is being threatened by earthquakes, and soon Will Mystery and the Thea sisters follow to help her find the secret of the fairies.

The Thea Sisters and some friends want to start a school newspaper. Then Colette's diary is missing and sports reporter Nicky, witnesses something suspicious at the Iron Mouse Games. The Sisters' try to solve both mysteries and still get the paper out on time.

"The Thea Sisters help their friend Beatrice prepare for the Summer Olympics!"--Publisher's description.

While the Thea sisters are at the excavation site of a dig at Hierapolis, Professor Brenninger unearths a series of priceless and very old figurines, but the Thea Sisters think the discovery may be a scam and investigate.

Using the clues found in Aurora Beatrix Lane's travel diary, the Thea Sisters continue their search for the seven lost treasures; and the object this time is the Ring of Eternal Love, a journey that begins in Verona, Italy, with the story of Romeo and Juliet and takes them around the world.

On summer vacation in Scotland, the Thea sisters are intrigued by a tapestry that is really a treasure map supposedly leading to a hidden alabaster garden where an ancient treasure is buried, and the story of Aurora Beatrix Lane, an adventurous explorer mouse--and when the tapestry is stolen they set out to find the treasure using the explorer's diary as a guide.

When Will Mystery calls, the Thea Sisters answer the call because there's trouble in one of the fairy kingdoms: a dragon's been turning all the fairies' precious gems into stone, and wrecking havoc throughout the Crystal Kingdom. It's up to the sisters to find out why the dragon is destroying this Kingdom and stop him before it's too late.