Harvard graduate James Averill is the sheriff of prosperous Jackson County, Wyo., when a battle erupts between the area's poverty-stricken immigrants and its wealthy cattle farmers. The politically connected ranch owners fight the immigrants with the help of Nathan Champion, a mercenary competing with Averill for the love of local madam Ella Watson. As the struggle escalates, Averill and Champion begin to question their decisions. During the Johnson County War in 1890 Wyoming, a sheriff born into wealth does his best to protect immigrant farmers from rich cattle interests.