The story of The Demon Lover begins with a secret society of mystics, in London, magically communicating over great distances with other occultists; so we learn that the society’s magic works, that it’s part of an international group, and that it’s scheming to gain political power at the urging of one member, a man named Lucas. We also see that much of the society is opposed to Lucas and his plots. This leads Lucas, after the meeting is concluded, to hatch a scheme of his own: to find an unsuspecting but psychically-gifted person to serve him as a medium, and through the entranced medium spy on the other members of the society in order to gain greater mystic knowledge.
The Demon Lover by Dion Fortune (used)
Weiser Books 1994
Used paperback in very good condition