Imagine you hear a strange sound coming from your attic one evening. What is scarier? That it's paranormal? Maybe a ghost haunting your space? Or that it's a person, an unknown intruder watching you from inside your own home? That is a question that a family in the German countryside had to ask themselves a hundred years ago. But we would never know their answer, because after hearing strange sounds coming from their attic, the entire family and their chambermaid were found brutally slain inside of their barn. What was tormenting the Gruber family?