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.

A late-night suicide hotline operator receives a disturbing call from someone claiming to be him, knowing personal details only he would know. The caller threatens to end his life within the hour, forcing the operator into a tense, emotional race against time. As the clock ticks down, he must confront his deepest fears and uncover the truth before it’s too late to save “himself.”

Follow the violent world of the Dutton family, who controls the largest contiguous ranch in the United States. Led by their patriarch John Dutton, the family defends their property against constant attack by land developers, an Indian reservation, and America’s first National Park.