Thea Stilton #28: Thea Stilton and the Riddle of the Ruins

A curious riddle! The Thea Sisters are off to an excavation in Hierapolis! But not everyone at the dig is happy to have new members on the team. While digging and learning more about the rich history of the land, one of the crew goes missing. Can the mouselets solve the riddle and find their missing friend? RELATED SUBJECTS: Lost and Found , Cooperation and Teamwork Thea Stilton #28: Thea Stilton and the Riddle of the Ruins PAPERBACK BOOK