In the late 1970s, FBI agents Holden Ford and Bill Tench venture into uncharted territory, interviewing imprisoned serial killers to understand the twisted logic behind their crimes and invent the science of criminal profiling. Aided by a sharp psychology professor, they turn candid, chilling conversations with real-life murderers into tools that reshape how law enforcement hunts predators. As they stare into the abyss, the work begins to seep into their own minds and lives. Meticulous, restrained, and quietly unnerving, the series is less a thriller than a cerebral study of the men who chase monsters and the toll it exacts.