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 survivors of a helicopter crash while the rest of the team tries to clear Kayce's name in a use of force complaint.

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.