Marshal Tim Donovan has been sent to investigate a series of holdups. Posing as a card sharp he soon believes he knows who is tipping off the outlaws. So he sets up a fake shipment knowing that if the stage is robbed the contact person will be identiifed. But the day the stage is due the Sheriff arrests the gang Tim was expecting to do the robbery.
Unfortunately the movie Riders of Black Mountain is not yet available on HBO Max.
| Directing | Sam Newfield | Director |
| Writing | Joseph O'Donnell | Screenplay |
