When the outlaw Casey O'Donnell steals $10,000 from the railroad, the townsfolk of Prospect Creek turn against his honest sons, Ryan and Alexander. It takes an act of bravery by Ryan to prove they are their father's son in name only. But even after Ryan is appointed deputy sheriff, they aren't allowed to enjoy their restored status for long.

Casey returns claiming that even if most of the stories about his outlaw activities are true, he didn't steal the money. So Ryan sets out to uncover the truth, but with the discredited railroad man Hudson Gilmore and a gun-toting U.S. Marshal on Casey's trail, the mission tests his loyalty to his family to the limit.