Under the reign of Louis XV, corruption and intrigue have been allowed to blossom in France.

Lord Justin Alastair, the notorious Duke of Avon, known for his coldness of manner, his remarkable omniscience, and his debauched lifestyle. Society believes the worst of Justin, who is clearly proud of his sobriquet, 'Satanas'. In a dark Parisian back alley, he is accosted by Leon, a young person dressed in ragged clothing running away from a brutal rustic guardian. The Duke buys Leon, a redheaded urchin with strangely familiar looks...