The investigation of Nighthorse heats up, but not in the way that Walt was hoping for. Cady makes a shocking discovery.

Walt is forced to split his focus between new evidence in a personal case, and the murder of a caretaker at a former Japanese internment camp.

A body found in the luggage of a tour bus further complicates Walt's troubles with Nighthorse. Henry makes a bold move to help a mother and son.

A highway robbery sets off an investigation into a strange relationship, while Walt struggles to let go of the past.

The team struggles with the fallout from Branch's confrontation with Barlow, and Walt's crusade to bring Nighthorse to justice spins out of control.

When the husband of a former soldier is assaulted during an apparent robbery, Walt is drawn into an emotionally charged investigation.

A young Native American girl is raped on the reservation, which sparks new, volatile tensions between local oil rig workers and the Cheyenne people.

Walt looks deeper into the Irish mob. Henry finds the book he needs, while Cady gets legal advice. Malachi and Jacob lob accusations at each other.

Walt seeks closure in his wife's murder and Henry's case. Branch is suspended but continues to investigate Jacob Nighthorse.

Walt unravels the puzzling case of a girl and her missing father. Henry helps Cady find a place on the rez. Malachi and Jacob's alliance is weakening.

Mathias must join forces with Walt after Henry discovers a drug dealer's body. Vic solves her housing problem. Malachi puts a bounty on Hector's head.

Walt's obsession with Jacob leads to more tension with Cady. Vic testifies against Gilbert. Walt's anger erupts at the Red Pony.

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.

Walt splits his time working on a murder investigation and serving as a judge for a local pageant. Cady hopes an old friend can help with Henry's case.

A shaky Walt searches for Donna as he and Vic reconstruct what happened in the cabin. Mathias has a deal for Henry. Cady tells Walt about a job offer.

When treasure hunters discover a body in a hollow tree, Walt finds a connection to an old case. Cady struggles to help a battered woman on the rez.

Walt gets more bad news from the mayor. Vic does a strange favor. As Walt learns what's behind the lawsuit, Henry and Cady each face tribal rituals.

Henry renegotiates his deal with Mathias. Walt's search for Donna leads to too many suspects. A phone message sends Walt down an unexpected path.

Depositions for Walt's case go badly. Ferg loses confidence in himself. Henry and Vic help lead Walt toward the big boss at Manifest Destinations.

Walt deals with the aftermath of Henry's arrest and Branch's shooting.The search for the shooter, however, is complicated by Branch's insistence that it was someone known to be already dead.

The line between justice and the law gets even blurrier for Henry and Walt as their hunt for a killer intensifies.

Walt and Vic investigate the bizarre kidnapping of a despised drug company CEO. Henry and Mathias deal with the ramifications of an overdose.

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.

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.

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.