Danny Tobin spent 15 years as a state trooper tracking down the worst kind of criminals. Rapists, human traffickers, cartel assassins. After dismantling an international crime syndicate and taking his boss down with it, Danny is enjoying an extended vacation in the Florida Keys when a phone call turns the trip upside down. When Danny and his partner JD agree to look into the case, it leads them down an ugly road that eventually forces them to reckon with someone who has been systematically tracking and killing child predators for decades. As the investigation deepens, Danny and JD discover that the damage is much worse than they thought and that the thread they’ve begun to pull on may eventually unravel a much larger tapestry.