With the help of Vic and Henry, Longmire investigates a backcountry murder with ties to a tribal family.

A wealthy beer distributor is brutally assaulted for a seemingly worthless painting; Vic's husband is jealous of her relationship with Walt; Branch's father uncovers information damaging to Walt's campaign.

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.

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