Dion Fortune's The Goat-foot God

Hugh Paston converts an old monastery into a temple in order to evolve the goat-foot god, Pan. He becomes possessed by the spirit of a 15th century prior who intends to use Paston's body as a vehicle to fulfil his own aims. The book describes the location of power centres in Britain. Bull, The Demon Lover, The Sea Priestess and Moon Magic, as well as several non-fiction studies of the occult.