A prison transfer goes awry and Walt urgently pursues a serial killer and his fellow escapees, who have taken hostages, up a mountain. Facing an impending storm with very limited resources, Walt’s mettle is put to the test and hypothermic hallucinations force him to face his past.

Walt and Branch team up when an apparent suicide is connected to Cady's accident. Meanwhile, Detective Fales returns with warrants, forcing Walt and Henry to face what happened in Denver.