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.
With the Yellowstone Ranch behind him, Kayce Dutton joins an elite unit of U.S. Marshals, combining his skills as a cowboy and Navy SEAL to bring range justice to Montana, where he and his teammates must balance family, duty and the high psychological cost that comes with serving as the last line of defense in the region's war on violence.