The more clues they uncover, the more deadly the investigation becomes.

After Cara Mead’s boss disappears on a hike, and money is discovered missing from the company they work for, Cara enlists the help of Ranger Brigade officer Jason Beck. But once the manhunt is set in motion, Jason and Cara find themselves embroiled in a fearsome conspiracy involving an abandoned mine deep in Black Canyon — and someone who will do anything to keep them from finding out the truth. As the danger escalates, Jason must choose between upholding the law…and following his instincts to protect the woman he won’t live without.