The ghost has held his own with his human fellow in fiction, and his tale has been [Pg viii]told with increasing skill as the art of the writer has developed. To-day the case for the ghost as an element in fiction is an exceedingly strong one. There has indeed sprung into being within a couple of decades a new school of such writers. Nowadays almost every fictionist of account produces one good thriller at least of this sort. The temptation is irresistible for the simple reason that the theme imposes absolutely no limit on the imagination.