More than fifteen years after the famous South Shields Poltergeist case of 2006, and its well-received book, The South Shields Poltergeist: One Families Fight Against an Invisible Intruder, Darren W. Ritson brings you Poltergeist Parallels and Contagion, a fascinating revised and updated study of the poltergeist enigma. After researching other equally bewildering cases - post South Shields - a number of serious thought-provoking hypotheses regarding the aspect of the poltergeist called 'contagion' have now been raised. Poltergeist contagion has been seldom discussed or studied by psychical researchers, despite many well documented historic cases making mention of it - that is, until now. During the South Shields case and its subsequent years, Darren W. Ritson and his co-investigator Michael J. Hallowell were also subjected to acts of poltergeist 'contagion'. Also noted, were astonishing similarities between cases they had investigated. This book, which was previously released as Contagion: In the Shadow of the South Shields Poltergeist in 2014, has been broadly revised and includes a new lengthily chapter on historic poltergeist cases from the UK and from overseas that feature striking parallels, and events of contagion. With its thought-provoking new ideas, Poltergeist Parallels and Contagion promises to cause some serious debate about the nature of the poltergeist and it begs the question; are there many poltergeists, or is there simply one?