 The little boy has a playmate at last.Dr Edward Carstairs, a noted psychologist, is called in to investigate the case of Sir Arthur Carmichael, a young man of twenty-three who woke up the previous morning at his estate in Herefordshire with a totally changed personality.Carstairs travels down there with a colleague called Dr Settle, who tells him that he feels that the house could be haunted, and that this phenomenon has connections with the case.