When a rancher dies after the bank forecloses the mortgage on his property, his son blames the banker for his father's death.

Town character Brett Conway blackmails Lucas with the knowledge that a young couple Lucas rescued are suffering from yellow fever.

When Lucas hires an ex-con as a ranch hand, the man is the first one under suspicion when a robbery and murder occur in the area.

Lucas and Mark attempt to reform a con-man.

Lucas agrees to take a job as a federal undercover agent and goes to Wyoming to investigate rumors of sales of arms to renegade indians. His life is endagered by the town drunk who stumbles onto his true identity and purpose. (Part 1 of 2)

Mark heads for Wyoming to search for Lucas, who's on the trail of a gang illegally selling weapons to the Indians. (Part 2 of 2)