Ancient treasures are kept safe within the mighty Heroes Hold. But the fierce Beast has somehow slipped inside. It’s on the hunt for 'Heroes', a book containing the power of all heroes from all stories. Can the Librarian and his helpers make sure the mighty book is never checked out? Uncover hidden dangers and dark mysteries with SECRETS OF THE LIBRARY OF DOOM, a page-turning chapter book series from bestselling author Michael Dahl. Part of the Secrets of the Library of Doom series.