Fredegonda, Goneril, and Drusilla are Great Hagges, much more important and much rarer than regular old hags. They think that ghosts these days are decidedly lacking - people haven't been scared of ghosts for years. So one day they decide that something needs to change - it's time for these ghosts to learn a thing or two about being scary. And what better way to teach them than to set up their very own school for ghosts?