In 1977 London; a family's home shows signs of poltergeist activity; prompting local newspaper reporters who are covering the story to ask an investigator from the Society for Psychical Research to help.
As the investigation into the haunting continues; Janet is further terrorized by the poltergeist; causing Guy - and a reluctant Maurice - to contact a medium to try and communicate with it; before their superiors are called in.
In order to rid themselves of the various investigators disrupting their lives; Janet and Margaret claim that the haunting is a fake before inviting Maurice and Guy back; who attempt to exorcise the spirits from the house for good.
