Dina's Book Shelter (which is actually not a store at all, but the headquarters of book agents who protect the entire principality) received an urgent call - a mysterious incident at a book exhibition. Agents Hedy Witch's Sock, Paulchen the Pirate Kid and Reginald the Confused set out to find out what's up, and they're joined by Mel and Arthur, book agents without covers. An old book has disappeared from the exhibition! True, it soon becomes clear that it was not stolen. She... escaped! And he’s going to make a real revolution in the book world! Now brave book agents must stop an army of zombie books, outwit misguided devils and find the pen with which the first magical book was written. And of course, save the book world!