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? Household spirits? Mysterious earth energies? Unknown powers of the mind? Or hoaxes? This ebook takes the well-known poltergeist phenomena - the movement of objects by invisible forces, the noises, the eruptions of fire, water and electrical disturbance - and maps them against changing ideas and beliefs. The author presents the latest theories and research evidence in his search for answers.