His interest in the paranormal began while working at "The Spectator". In 1978 Inglis published "Natural and Supernatural". With Arthur Koestler and Tony Bloomfield he co-founded the KIB Society to sponsor paranormal research (which was later renamed the Koestler Parapsychology Unit). He published a work on people who enter trance states ("Trance: A Natural History of Altered States of Mind") and his last work, written as a tribute to Koestler dealt with the subject of synchronicity. It was entitled "Coincidence: A Matter of Chance or Synchronicity?".