Join the Thea Sisters on a mysterious adventure in Thea Stilton and the Secret of the Old Castle!

When the sisters receive a letter from a friend in Scotland, they’re thrilled to visit a beautiful old castle steeped in legend. But their excitement quickly turns to intrigue when they discover that the castle holds hidden secrets—and perhaps even a hidden treasure!

As strange events unfold, the sisters must follow clues, solve riddles, and brave eerie passageways to uncover the truth. Filled with suspense, friendship, and a touch of magic, this captivating story will enchant young readers who love mysteries and the thrill of discovery.

Will the Thea Sisters unlock the castle’s secrets, or will they be lost to time? Find out in this enchanting adventure!