The Green Stone without doubt is a gripping adventure. Also without doubt it is based on facts which arose via mediumship. There are incidents in the story which are clearly 'projections' of the minds of the people concerned, and there is a certain amount of manipulation in order to present a coherent story. The follow-up novel "Eye of Fire" went further down this road, unfortunately, and I am certainly no great admirer of Graham Phillips' later contributions to occult fiction. Nevertheless, The Green Stone was - I sincerely believe - written as a result of genuine psychic experience and there is ultimately no ready-made explanation for the events it describes. It is a rare book - at least the 1st edition - and it is difficult to see why. At any event, it stands head and shoulders above what passes for occult fiction these days, and is a thoroughly good read from cover to cover.