And in the final part of the Sorme trilogy, The God of the Labyrinth (The Hedonists in the US), published in 1970, just before The Occult, Sorme researches an eighteenth-century rake by the name of Esmond Donelly. On an increasing number of occasions he finds himself seeing the world through Donelly’s eyes, gradually becoming his subject.
So we have devil worshippers, ghosts, telepathy, men with ‘strange powers’, duo-consciousness, and there are many other such ‘occult’ instances in the early novels, most of which had been out of print for some time before Valancourt Books set about systematically reprinting them in 2013.