
With the Yellowstone Ranch behind him, Dutton joins an elite unit of U.S. Marshals, combining his skills as a cowboy and Navy SEAL to bring range justice to Montana. Kayce and his teammates -- Pete Calvin, Belle Skinner, Andrea Cruz, and Miles Kittle -- must balance the high psychological cost of serving as the last line of defense in the region's war on violence with their duty to their families.

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.

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