Hellweg's Keep by Justin Holley

If you liked Caitlin Starling's The Luminous Dead and The Deep by Nick Cutter then you'll love this detective, horror, science fiction adventure.
Thirty-seven miners disappear without a trace within a Titanium mine, Hellweg's Keep, deep within Zeta One, a moon orbiting the planet, Terra. When FBI agent Kendra Omen arrives via the spaceship Marietta, strange phenomenon begins to manifest...suicides, shadows a shade darker than the shadows they move within, disembodied whispers, and Kendra would swear she catches a glimpse of her own deceased daughter walking the dimly lit halls of Hellweg enterprises. But that's impossible. Isn't it? As evidence of occult practices at the mine emerges, Kendra realizes the answers they seek, and hopefully the thirty-seven miners, will only be found underground in the claustrophobic labyrinth of shafts and natural caverns within Hellweg's Keep.
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