 In September 1977 he investigated an alleged poltergeist in a house in Green Street, Enfield, North London, that later became known as the Enfield poltergeist.Grosse claimed to have recorded many hours of audio and video evidence of the poltergeist while staying at the house for long periods of time, along with another psychical investigator, Guy Lyon Playfair, who later wrote the book "This House is Haunted" (1980).Sceptic Joe Nickell criticised Grosse and Playfair's investigations as "credulous".