During China’s tumultuous Cultural Revolution, the People’s Liberation Army dispatches an elite group of prospectors famous for their work uncovering rare minerals to the mountains of rural Inner Mongolia. Their assignment: to bring honor to their country by descending into a maze of dank caves to find and retrieve the remnants of a buried World War II bomber left by their Japanese enemies. How the aircraft ended up beneath thousands of feet of rock baffles the team, but they’ll soon encounter far more treacherous and equally inexplicable forces lurking in the shadows. Each step taken—and each life lost—brings them closer to a mind-bending truth that should never see the light of day. Pride sent them into the caves, but terror will drive them out.