Thea Stilton and the Prince's Emerald is part of the Thea Stilton book series, which follows Thea Stilton, the adventurous sister of Geronimo Stilton, and her group of friends known as the Thea Sisters. In this particular book, the Thea Sisters travel to India to attend a royal wedding.

The adventure begins when the emerald set to be part of the royal crown is stolen. The Thea Sisters take it upon themselves to solve the mystery and retrieve the precious jewel. Throughout the story, the girls encounter cultural experiences, thrilling moments, and uncover clues to find the thief.

The book blends mystery, friendship, and cultural exploration, making it an engaging read for young readers who enjoy adventure and detective stories.