In 18th century France, the Chevalier de Fronsac and his Native American friend Mani are sent by the King to the Gevaudan province to investigate the killings of hundreds by a mysterious beast.
An all-expenses-paid international search for a rare copy of the book 'The Nine Gates of the Kingdom of Shadows' brings an unscrupulous book dealer deep into a world of murder, double-dealing and Satanic worship.