Stefany Mathias

When a Cheyenne woman, Gabriella "Gab" Langton (guest star Julia Jones) is assaulted on the Rez by oil rig workers, both Mathias and Walt find themselves unable to pursue the suspects due to issues of jurisdiction. But Cady is determined and seeks the help of a Federal Prosecutor to bring Gab's assailants to justice.

Walt deals with the fallout of the shooting of Tyler Malone (guest star Nick E. Tarabay) and the arrest of oil rig worker Trot Simic (guest star Aaron McPherson), while an injured Henry goes on the run with Gab Langton in search of a mysterious Crow Medicine Woman (guest star Tantoo Cardinal). Meanwhile, new deputy Zach Heflin (recurring guest star Barry Sloane) puts his job on the line when a confrontation with a suspect turns violent.

Billy and Cody Lefever move to North Dakota hoping to cash in on the largest oil discovery in American history. Cody becomes uncertain about her husband's choices when Billy crosses paths with a powerful oil baron named Hap Briggs.