As someone who works in the paranormal field in my spare time, this story hit a lot of really hot spots for me.  Of the various haunted house tales that I have read and heard, this one really spoke to a lot of what I have seen, heard, and felt in dealing with the spirit realm.  The story is chilling, to experience it first hand, would have been crazy! Blackwood is known to be the master of the English ghost story and this is a great example of that legacy.