Taking place six years after Wyatt Earp has left Tombstone, Wyatt is building his own town in far northern California when he is confronted with something much worse than any of the outlaws he has faced before -- the legendary and menacing Emmett Black and his Black Train. A sweeping film shot in Colorado, Utah, Wyoming, and Kansas, Wyatt enlists the Pinkerton Detective Agency and Bass Reeves, who is arguably the most effective U.S. Marshal in the history of the west, to help him in his fight.