When his good friend Simon Aron's naive curiosity is tested, the Duke, along with his ever-patient friends Rex Van Ryn and Richard Eaton, must intricately plot a means of both physical and spiritual rescue. But with Van Ryn's affection for a beautiful woman caught in the web of Satanists, and Eaton's ongoing skepticism, they all risk being brought to the verge of madness by dabbling with the powers of evil.

From London to the West Country, the slums of Paris toa Christian monastery, the action of this powerful occult thriller moves with fantastic, compelling force.