When a standoff between Broken Rock and local ranchers over a mine groundbreaking turns violent, the Marshals launch a manhunt to find the shooters.

As Kayce tries to embrace his new beginning, a Marshals op to stop a domestic terror attack lands him in a valley of buried Dutton family skeletons; while confronting his past, Kayce must also learn to ingratiate himself with his new teammates.

Kayce Dutton reunites with an old SEAL teammate and aids his Marshal unit in hunting down a bomber targeting Broken Rock Reservation; the trail leads to a dangerous encounter with an armed anti-government militia.