After a crazy encounter with a supernatural dark force, our first group of heroes, the Mad Hatters, find themselves within the book world of Thea Stilton who writes about the adventures of her prized students, the Thea Sisters; Nicky, Paulina, Violet, Colette, and Pamela. They encounter great things about the team, as well as some deep personal secrets as well. Can the group of detectives unite and solve a brand new mystery in this special Crossover?
12 parts