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.

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.

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?

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.

"While the Thea Sisters are on a tropical vacation in the Bahamas, they stumble upon an old pirate map! It's related to a local legend. Could it lead to treasure?! The five mice venture onto the sparkling Caribbean Sea to follow the map... but someone else is trying to find the treasure first. It's a dazzling adventure!" --

"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?"--

The Thea sisters are off to Madagascar for Adventure Camp. While on the nature preserve, they discover that endangered animals are under threat.

"When the Thea Sisters' friend Ashvin is in trouble, they rush to his aid--in India! Ashvin has been working to return the monkeys living in the big city to their natural jungle environment. But the monkeys have suddenly started stealing jewels! Can the Thea Sisters figure out who is behind this terrible theft?"--P. [4] of cover.

"The Thea Sisters are in Brazil for the summer Mouselympics! They've been invited to watch their friend Beatrice and her team train for the big race. Strange things start to happen during practices. The team's sneakers get stolen, their batons go missing, and the team members start to lose patience with one another. Can the Thea Sisters help figure out what's causing all the trouble before it's too late?"--Back cover.

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