Sheriff Longmire runs a small department in rural Wyoming. When the body of a man is found in the woods the investigation leads to tension between Longmire and the local Indian Reservation, as well as between Longmire and his Indian friend who runs a local bar.

When the body of a young girl is found at a rest stop with a bunch of money, the investigation leads to a group of young Mennonites on rumspringa.

A barn fire kills not only several prize winning show horses but also the owner. As the investigation continues, it starts to look more like an insurance fraud gone wrong.

A double homicide helps uncover a shocking partnership between the Cheyenne reservation and a Mexican drug cartel.

Cheyenne boys are disappearing, and the case may be connected to dishonest child welfare workers, a Cheyenne warrior legend, and an an ambitious Cheyenne political leader.

A paroled killer is mauled by a bear, but Longmire suspects that there is more to the story. Meanwhile, Branch's uncle creates havoc for the sheriff's department.

Walt investigates the murder of a beer distributor, where the main suspect is a bronc rider, but a stolen painting and secret affair lead to many motives for the brutal crime.

A highly agitated young girl approaches a gas station owner for help. When Sheriff Longmire attends the scene, the owner is dead and the girl is missing. Investigations lead Longmire to existence of a religious cult in the neighboring Cumberland county.

The president of the Reservation Tribal Council is run off the road, shot and killed. Inquiries reveal that the president recently pushed though a council amendment to the blood percentage rule, thereby excluding a significant number of tribe members from their entitlements.

When Walt is called to the scene of a murder of a local youth, he instantly recognizes him as one of a group of four boys who were acquitted of the rape of an developmentally challenged Cheyenne girl. With the cause of death being an arrow to the chest, Walt must act very carefully as tribal tensions are still high surrounding the failed rape case. Meanwhile, the relationship between Walt and Branch continues to break down, and a Denver detective arrives in town to interview Walt about another murder case.