An instant New York Times, USA Today, and Indie bestseller!The next installment in the New York Times bestselling Sworn Soldier series, featuring Alex Easton investigating the dark, mysterious depths of a coal mine in AmericaAlex Easton does not want to visit America. They particularly do not want to visit an abandoned coal mine in West Virginia with a reputation for being haunted. But when their old friend Dr. Denton summons them to help find his lost cousin-who went missing in that very mine-well, sometimes a sworn soldier has to do what a sworn soldier has to do...