A year ago in Afghanistan, Green Beret Heath Daniel's career was destroyed. Along with his faith. Now he and his military war dog, Trinity, train other dogs and their handlers. Though his passion is to be back in action, the medical discharge has forced Heath—and Trinity—to the sidelines. Military intelligence officer Darci Kintz is captured while secretly tracking the Taliban. Only one dog can handle the extreme conditions to save her. Trinity. Only one man can handle Trinity. Time is running out on the greatest—and most dangerous—mission of their lives.