The Thea Sisters are five fun, lively students at Mouseford Academy on Whale Island, who want to be real, live journalists, just like their hero, Thea Stilton. Between classes, friendships, crushes, and some bizarre mysteries to solve, they find life to be a never-ending adventure!
Colette, Violet, Pamela, Nicky, and Paulina are working on a historical restoration when they learn about an ancient Viking vessel that sank off the shore of Whale

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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 finally Bolivia.

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.

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.