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.

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 he must also learn to ingratiate himself with his new Marshals teammates

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

Kayce and Cal search for the survivors of a helicopter crash while the rest of the team tries to clear Kayce's name in a use of force complaint. While on the search Kayce and Cal encounter a wanted felon and the harsh nature of Montana's wilderness.

When Kayce and Tate cross paths with an old friend of Tate's from the rez, Hayley, who exhibits behavior consistent with a trafficking victim, Kayce throws himself into tracking her down rather than committing to commemorating Monica.

After losing the trail of teen trafficking victims, Kayce must tell Tate that his friend may be gone for good. When the Marshals learn the girls are in the hands of a violent motorcycle gang, they launch a dangerous op to infiltrate the gang.

When a federal judge and her family are the targets of a car bomb, the Marshals are assigned to guard them. Family secrets start to surface as the Marshals start to look into why someone would want this family dead.

The Marshals go manhunting after receiving a tip that a dangerous fugitive is on the loose. Kayce and Cal struggle to reckon with their time at war when a former SEAL brother, Garrett, drifts back into their lives as they hunt a vicious enemy.