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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About the author: Justin Holley is the author of the novels Hellweg’s Keep, Blood from the Stars, Tethered to Darkness, Seven Cleopatra Hill, the three-book Bruised series, and several pieces of short fiction, haunting anthologies and magazines around the world. Bruised made Grand Master Brian Keene’s 2015 list of top 15 books. When not traveling, Justin lives somewhere on the Cass Lake chain of lakes with his wife, and also a rather large Daneiff named Nu and a clever but tiny Devon Rex named Jinx. He’s hard at work on his next novel when not boating, investigating the paranormal, golfing, or playing volleyball. Hearing from fans is highly desirable, and the best way to contact Justin is through his website, or come visit with him in person at conventions and book signings.