Les Daniels – The Black Castle

Les Daniels – The Black Castle (Sphere, 1980)

Blurb:
DAMNED FOR ETERNITY!
In the shadow of the black castle the witches have met. And by sunrise their pagan rites and identities are known to the Grand Inquisitor. Soon a beautiful woman will be consigned to the flames of Hell.
For Don Diego, and his brother, all has gone according to plan. Don Diego has proved his faith to God. Sebastian has served his own dark master. The living and the undead have joined forces to spin a web of perfect evil.
Then, as the beautiful sinner’s life hangs in the balance, Sebastian conceives an unearthly passion for her body ‑ and her soul. Brother must fight brother in a terrifying struggle for control of the demonic powers housed within THE BLACK CASTLE.