In winter 2012, Mason Caldwell was outside, smoking in the ruins of a once-glamorous skyscraper. Unaware of a silent stranger approaching from behind, Mason raised his gun in instinctive self-defense—nearly ending a life. Suspicion, paranoia, and a brutal past define him. Trust is a rare commodity in his dark world, and one wrong move could be deadly. But who knows, maybe you can become good survival partners, because the guy is clearly interested in the person who so imperceptibly managed to approach him from behind.