In the turbulent shadows of West Texas, Cass Callahan uncovers a deadly conspiracy that threatens everything he holds dear. Weighed down by inner turmoil, Cass is urged to take a step back. But when a mysterious Chinese man dies at the border during a campout, his gut tells him something is dangerously wrong. With the arrival of secretive neighbors and a body washing up from the Rio Grande, Cass throws all caution aside, diving into a darkness that could tear his world apart. As his investigation spirals, so does his life. Sheriff Chance Gilbert is brutally attacked, Raven is caught in the crossfire, and Cass is pushed to his breaking point. In a bloody rescue mission, Cass and his small team battle to bring justice to the borderlands. But as relief sets in, a more sinister, far-reaching conspiracy comes to light?one that threatens not just his town, but the entire state of Texas.