Sally is up against a power that seems to involve the mysteries of life and death. A spiritualist seance provides the first clue; a disappearing magician, a document in the Patent Office, a Swedish industrialist of immense and deadly power, and the most beautiful young woman in England all play their parts. I had great fun with the theatre in this story - the bright colours, the vivid situations, the sense of hard sweaty strenuous effort behind the scenes, and swiftness and mystery and phantasmagoria in front.