Children's drama series. Frustrated with Marnie, the Shoebox Zoo decide to track down the Book on their own. Marnie discovers a traitor in her midst, and goes to the Inner Sanctum to confront Michael Scot. When she finds the Shoebox Zoo, Marnie notices a clue that leads to a hidden door. The passage behind the door reveals a magical tunnel of books, and a vision of Marnie's mother, but will it lead to the Book of Forbidden Knowledge?