Ghosts can take many forms; the souls of the departed; reflections of past events - or those who just frustrate us by moving things around. There is, however, a fourth kind, defying description, who delight in inflicting suffering and pain - and even death, itself, on rare occasions. For the most part, however, they do us little harm - inhabitants of a nether world from which they, rarely, venture forth. They exist, primarily, in tales told around...