John Smiley is a travelling entertainer. As he and his son and daughter are approaching the small township of Silver Spur in Kansas, they encounter Black Bart, a notorious gunman, who demands money and carbine whips Smiley's son. Smiley, however, is a skilled boxer and humiliates the outlaw, leaving Black Bart hell-bent on revenge, leading to a series of dark and bloody events when the family reach their destination.