The Thea Sisters are thrilled about the new performing arts program being offered at Mouseford Academy. That is, until they meet the head of the department--the demanding and strict Professor Ratyshnikov. The mouselets will have to audition just to get into her class! On top of the that famouse ballerina is an old friend of Headmaster de Mousus, but the two no longer get along. It's up to the Thea Sisters to find out why. -- Back cover.

There's going to be a musical at Mouseford, and the students can't stop squeaking about it! Everyone wants a role, but the auditions won't be easy. Plus, sneaku Ruby Flashyfur has some tricks up her sleeve! Will the Thea Sisters come out on top...or will they be singing a different tune when the auditions are over? -- Back cover

Mouseford Academy is celebrating their 600th anniversary and the headmaster and teachers decide to put on a play of the famous Mouseo and Juliet. The Thea Sisters want the role of Juliet but so does their rival, Ruby Flashyfur.

"The Thea sisters are off to Japan on a cultural exchange program. While they're busy exploring Kyoto and admiring the beautiful cherry blossoms, a valuable item is stolen from their friend Kumi's family. Will the five mice be able to catch the thief?" -- P. [4] of cover.

When a member of their group goes missing, the Thea sisters head to Niagara Falls to find him.

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 finallyBolivia.

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.

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.--

"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?"--Publisher....

The Thea Sisters participate on a dig at Hierapolis. During their visit to the excavation site, Professor Brenninger unearths a series of priceless and very old figurines. But the Thea Sisters soon figure out that it's a scam. They start to investigate and discover that the figurines are fake, exposing Professor Brenninger's plans.