Based on the "Walt Longmire" mystery novels by Craig Johnson.

"Longmire returns for its fourth season with more mystery, drama and dark secrets from Absaroka County, Wyoming. The new season finds unflappable Sheriff Walt Longmire and his deputies trying to put the troubling events of the past behind them. The mysterious White Warrior who tormented Branch is dead. Walt's best friend Henry Standing Bear is a free man. Longmire's right-hand deputy Victoria 'Vic' Moretti is newly divorced. And the mystery of Walt's wife's murder is seemingly resolved. But just as it looks like a second chance is truly possible for everyone, the opening of the new casino on the Reservation brings dark new problems to Walt's corner of Wyoming. And his fresh start is further threatened as it becomes clear that some people cannot truly move on until they have either forgiven past injustices or avenged them."--Container.