The world nearly ended. Again. They fixed it, of course, but things got a little... jostled. In the Great Library, where all the books that ever were or will be are stored for safekeeping, the Nobles of the Historian Angel are summoned to a task. Some of the most potent and dangerous books have gone missing in the wake of the recent cataclysm. Lost, or stolen. If they are not found, it could mean the end of the world. Again.