Step into the spotlight with Geronimo's bold and adventurous sister, Thea Stilton, in a super special mystery that will keep you guessing. When Thea accepts an invitation to teach a journalism class at a prestigious college on Mouse Island, she expects a quiet semester of writing and reporting. But when one of her very own students suddenly vanishes, the classroom turns into a real-life crime scene. You will team up with Thea and five brilliant students as they follow a trail of nail-biting clues, uncovering underground tunnels and dusty secret passages along the way. Can these clever young detectives crack the dragon's code and rescue their friend before time runs out? Packed with action, teamwork, and thrilling surprises, this adventure proves that solving a mystery is always better when you do it with great friends.