In a fog-filled 19th-century San Francisco, Brett Kingsford, a debonair occult expert, is drawn into a bizarre investigation when a series of brutal murders rock the city. These killings bear uncanny marks of ancient ritualistic practices, prompting the local police to seek Kingsford's unique expertise. As he delves deeper, Kingsford uncovers disturbing connections to a mysterious cult with links to dark, supernatural forces. Amidst eerie encounters and chilling visions, he realizes that stopping the murderer will require more than just logic and bravery; it will demand an understanding of arcane knowledge and forbidden lore.

Kingsford's pursuit leads him through shadowy streets and hidden chambers where secrets fester and danger lurks at every corner. His investigation brings him face-to-face with both seedy criminals and high society figures, all seemingly entangled in the web of dark mysticism. As he pieces together the clues, he discovers a sinister plan that threatens not only the city's safety but also sanity itself. With time running out, Kingsford must race to confront the malevolent force responsible for the terror before it claims more victims. The truth he uncovers is more shocking than he ever anticipated, pushing the boundaries of his own courage and understanding.