Sheriff Longmire is called in to investigate the death of a patient found poisoned at the Durant Home for Assisted Living, and as he searches for the killer, he uncovers shocking secrets about the victim that could tear their small town apart.
Transporting a confessed murderer only to learn that the man's crime falls under his jurisdiction and that the killer has escaped, Sheriff Walt Longmire taps insights from Indian mysticism and Dante's "Inferno" in a manhunt through the icy Cloud Peak Wilderness Area.