Very unnerving, black and white film of the book by Shirley Jackson.  Things go bump in the night, frequently, in a gloomy mansion being investigated by ghost hunters.  The creepy surroundings are dimly lit and expansive, ghostly, unintelligible conversations are overheard.  Shadows crawl.  Effective, tense direction provided by Robert Wise.  Are the hauntings real or simply created by our imaginations?