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 the team explore Absaroka's Basque community when a shepherd and his dog are found dead. Branch walks a thin line in his alliance with Jacob Nighthorse. Meanwhile, Cady looks to Detective Fales for answers about her mother's death.

When a wild horse is found dragging a dead body, Walt discovers evidence of an illegal rodeo at a local farm. Detective Fales comes to town to talk to Henry.

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.