Introverted scholar Percival Endicott Whyborne wants nothing more than to live quietly with his lover, ex-Pinkerton detective Griffin Flaherty. Unfortunately, Whyborne's railroad tycoon father has other ideas, namely hiring Griffin to investigate mysterious events at a coal mine. Whyborne, Griffin, and their friend Christine travel to Threshold Mountain, a place of dark legend even before the mine burrowed into its heart. A contingent of Pinkertons-including...