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. 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, which for Kayce includes his son Tate and his confidants Thomas Rainwater and Mo from the Broken Rock reservation.