The Unthinkable has devastated the west coast, turning thriving towns into debris-filled wastelands. Lorry Martens, a former special operations medic struggling with PTSD and living in a reclusive barge community, has long repressed her lethal combat and interrogation skills. All she wants is a simple, peaceful life, but after Neil is murdered, she uncovers his role in an ancient conspiracy. Lorry is pursued into the shattered landscape by the deadly shadows of his secret life, and is forced to rediscover—and confront—the darkest parts of herself.