From the introduction: You belong to a cell of paranormal investigators. You have glimpsed unspeakable things that live in the darkness beyond the light of human understanding, and yet you still dare to seek them out - to warn others and perhaps contain or banish them if it is within your capabilities. Walter Blackthorne, leader of the Esoteric Order of Nameless Sensitives (EONS), has just been found dead - in a locked room and ravaged as if by a wild beast! You and your fellow EONS are stunned, and wondering who may be next!