Are you ready for a thrilling adventure with the super-stylish Thea Sisters? Join Thea Stilton and her amazing friends at Mouseford Academy! Their marine biology class takes an unexpected turn when they learn about a legendary shipwreck and a very rare diamond called Jasmine's Heart, lost deep in the ocean. Things get really exciting when their professor, Van Kraken, suddenly disappears! Now, it's up to the Thea Sisters to become detectives and brave divers. They'll have to plunge into the mysterious ocean depths to find their teacher and uncover the secrets of the sunken ship and its precious jewel. But the adventure doesn't stop there! Just when they think their mission is complete, an invitation arrives to travel all the way to China for another missing treasure hunt. Get ready to explore the world with these five smart and brave mice as they solve puzzles, discover secrets, and stick together through every challenge. It's a journey you won't forget!