Sworn Soldier 3: What Stalks the Deep - T. Kingfisher
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Alex 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...
