At his dying friend's side, Rafe Covington (Tom Selleck) vows he'll take care of his buddy's wife, Ann, and protect her ranch. But Rafe's solemn promise angers cattle baron Bruce Barkow (Mark Harmon), who's threatening Ann and other townsfolk in an effort to acquire their property. As the time for Rafe's clash with Barkow draws closer, Rafe also struggles with his feelings for Ann.