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)

Lucas, accused of horse theft, struggles to clear himself before a lynch mob catches up.

Trouble brews at Lucas's when a whisky salesman and a gunfighter fall for the same woman.

Lucas tries to find out why Mark has taken a job as a stableboy.

A peddler is implicated in a series of murders.

Gridley Mau is gunning for Lucas, who killed his father during an attempted robbery.

Lucas is thrown into jail to stop him from murdering an old enemy.