Gyre Price, an amateur caver from an impoverished mining world, is desperate to earn enough money to discover the fate of her mother, who abandoned their family when Gyre was young--and she isn't above falsifying her qualifications to get the high-paying job she needs. Aware of Gyre's deception, Em, Gyre's controlling, manipulative handler, guides her on a harrowing journey into the depths of a rarely explored cave system on some unexplained, ill-fated...