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.

When a body is found in a compost heap, the victim's history of abusive behavior leads to a varied list of suspects. Walt and the team must cross county lines to track down the killer. Branch looks into Cady's abrupt departure from Absaroka.

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.

A cattle heist sends the team on an urgent search for the missing livestock and driver as well as the thieves. Walt is concerned by Vic's fearful behavior when she receives a mysterious bouquet of flowers.

When a teenage girl is found dead, Walt and the team investigate ties to the illegal sale of prescription drugs. Meanwhile Henry reconnects with an old flame and Cady returns home.

After Henry overhears a disgruntled husband try to order a hit on his wife, Walt and the team must use what little information they have to prevent her murder. Vic is wary when an ex-cop from Philly shows up in Durant.

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.

Following an explosion on the reservation and the discovery of a charred dead body, Walt is bombarded with public confrontation as the Cheyennes blame the blast on gas leaked from fracking by Newett Energy. Meanwhile, Branch reconnects with Cady and uncovers information that could help him in the election.

On election day, Walt and Branch aren't thinking about politics when Cady is badly injured by a hit-and-run driver. Vic and Ferg investigate, and Walt has a flashback to when Cady was a little girl.

When a game warden is killed alongside an elk that was poached, Walt discovers a connection to a rare expensive supplement. Walt completes his sacrifice, and Branch closes in on the truth about Cady's accident.

Longmire investigates after he receives a safe deposit box from a just-murdered inmate that contains a severed finger that is linked to both a new murder and a 20-year-old armed robbery. At the same time, Vic's paranoia peaks when she suspects she is being stalked, forcing her to confide in Walt.

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.