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.