Geronimo Stilton. Thea Stilton

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"An adventure down under! Moldy mozzarella! A flock of sheep at Nicky's family's Australian ranch was losing all its wool, and no one knew why. Nicky and her friends the Thea Sisters headed to Australia and set off on a tour of the whole country in search of clues. What happened next turned out to be a truly memorable Outback adventure!"--P. [4] of cover.

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"The Thea Sisters travel to New York to cheer for Nicky as she runs the Big Apple Marathon. While there, they visit Pamela's family and have a delicious dinner at the family's pizzeria. But when someone threatens to burn the restaurant down, can the Thea Sisters catch the troublemaker and solve the mystery?"--Page 4 of cover.

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Returning to Scotland to help Bridget's family repair their ancient castle, the Thea Sisters launch a determined rescue attempt when Bridget is kidnapped, in an adventure marked by mysterious messages, hidden treasures, and Celtic legends.

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The Thea Sisters travel to Italy for a ballet competition and must figure out who is trying to sabotage the contest.

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At a festival in Spain, the Thea Sisters become involved in a mystery after a valuable fan is stolen.

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Attending an art class in the Netherlands, Violet journeys through the flower gardens, windmills, and canals of Holland to investigate the untimely disappearance of her friend's father, a renowned botanist whose absence is linked to a rare black tulip.

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While vacationing in Greece, the Thea sisters are asked to help find an actor who has gone missing right before the opening of his play.

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While on vacation in the Bahamas, the Thea sisters stumble across an old pirate map and endeavor to find the treasure, unaware that someone else is also seeking the prize.

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Attending an adventure camp in Madagascar, the Thea Sisters enjoy learning about the region's exotic plant and animal species before discovering that someone has been stealing endangered animals from the jungle.--

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The Thea Sisters are headed to Venice, Italy! They'll be there for the Carnival, an annual festival that's famouse for its elaborate masks. The mouselets love exploring the city's bridges and canals, and seeing the beautiful costumes mice wear to Carnival celebrations. But a mysterious thief strikes while they are there!

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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.

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While attending the Festival of Time in Germany, the Thea sisters investigate the theft of a famous clock.

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The Thea Sisters are off to save the rainforest in Malaysia!

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"The Thea Sisters are heading to Rome! They were chosen to be part of an international archaeology competition. The mouselets have to follow clues through Rome to solve puzzles and win the golden cup. But as they explore the beautiful city, the sisters get the sense they are being followed, and worse, someone is going through a lot of trouble to slow them down. can teh mouselets figure out who is trying to sabotage their chance at the prize before...

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

The Thea Sisters are going to New Zealand! Their new friend Charlotte wants to show them the sights, and introduce them to Didi, a skeleton of a bird that went extinct many years ago. But when they get to the mouseum, Didi has gone missing! Can they find the stolen skeleton before it is too late?