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FBI agent Frank LaCrosse's homecoming turns into a nightmare when he finds his son missing and the babysitter brutally murdered. The case becomes a desperate pursuit to catch a serial killer who has been active for nearly two years, with a trail of victims across Texas. As Frank searches for the killer, local authorities investigate the murders amidst a heated election feud. Meanwhile, a mysterious doctor and a former railroad worker become entangled in the case, leading Frank to a chilling race against time to catch the sociopath before he disappears into the mountains.