A mysterious woman known only as Xana, whose testimony is critical to dismantling a dangerous cartel, is pursued and run to ground in the frozen north Idaho woods. Her treacherous journey is only beginning. Zeke Mendoza, a top U.S. assassin, grapples with the last remaining shreds of his humanity as he joins the chase across the western United States. Jake Connor, a former police officer shattered from profound personal loss and years of solitude, is pulled from his self-imposed inertia when recruited to ensure the safety of the witness. This is the complex web entangling retired cop Vic Tyler and Captain Nina Vasquez of the Arizona State Police. Their latest gripping saga plunges them into a risky world of desperate measures that could either save Xana or seal her fate.