books.google.co.uk - A new ebook introduction to poltergeists examining the theories and presenting the latest research evidence for poltergeist activity. Thee book explores possible answers to the question ‘what is a poltergeist’?What is a poltergeist? Are they the restless souls of the dead? Demons? Witches’ familiars?...https://books.google.co.uk/books/about/What_is_a_Poltergeist.html?id=8WerJAw6YtMC&utm_source=gb-gplus-shareWhat is a Poltergeist?