Threshold by Jordan L. Hawk

Introverted scholar Percival Endicott Whyborne wants nothing more than a quiet life with his lover, private 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 long before the mine burrowed into its heart. A contingent of Pinkertons—including Griffin’s ex-lover Elliot—already guard the mine. But Griffin knows better than anyone just how unprepared the detectives are to face the otherworldly forces threatening them… Read more.
Trigger & Content Warnings:
- Racism
- Night terrors
- Emesis
- Death of an infant mentioned
- Explosion
- Fire
- Gun violence
- Sword violence