The Barkley's mining investments now are entangled in the scheming hatred of the Molly Maguires. On one end, they must deal with the violent corruption of this group that's infiltrated the disgruntled workers at a mining camp. At the other end of the spectrum is corruption on the part of the mine's shareholders, who want to make a better profit by exploiting the workers' strike and bringing in cheaper labor in the form of the Chinese. Heath volunteers to get to the root of the problem - if he can avoid getting shot first.
The suspense in this episode is decent, but there are plenty of holes in the plot. Heath's "stand up for the little guy" speech to the rest of the family upon his return is more contrived than convincing. Heath also manages to single-handedly get past all six of the armed Mollies without a scratch, and enters a dark mine without any of them trailing him. He then saves the mine from the evil O'Doul, who has already lit the fuse on the dynamite to blow it up. And strangest of all, in an episode centered around broken promises, he never does deliver on his oath to help out the spunky little saloon hussy (Anne Helm), who saves his buns more than once.