The powers of good are pitted against the forces of evil as the Duc de Richelieu wrestles with the charming but deadly Satanist, Mocata, for the soul of his friend. Mocata has the knowledge and the power to summon the forces of darkness and, as the Duc de Richelieu and his friends remain within the protected pentacle, they are subjected to ever-increasing horror until thundering hooves herald the arrival of the Angel of Death.

For years, a blackmailer has been preying on the weaknesses of others throughout London. When Holmes hears of the utter misery this mystery man is creating, he adopts a campaign to thwart his evil scheming. The campaign astonishes Dr. Watson by its strangeness and finds Holmes falling in love.

Following a nervous breakdown, Gwen takes up the job of head teacher in the small village of Haddaby. There she can benefit from the tranquillity and peace, enabling her to recover fully. But under the facade of idyllic country life she slowly unearths the frightening reality of village life in which the inhabitants are followers of a menacing satanic cult with the power to inflict indiscriminate evil and death if crossed.