Wells Fargo sends Johnny Macklin (Johnny Mack Brown) to Rimrock to investigate stage hold-ups and general lawlessness which, according to local agent Tom Jamison (Steve Clark) is caused by saloon owner Steve Corbin (Tristram Coffin) and his henchmen Duke Sprague (Marshall Reed) and Ace Jenkins (Terry Frost). When Steve kills a man he had cheated in a poker game, the Rimrock Chronicle, owned by Idaho Jim Foster (Raymond Hatton) and edited by his daughter, Diane (Reno Browne), starts a vigilante movement to clean up the town. Jamison, also the mayor, swears Johnny in as the town marshal. Johnny lets henchman Slats Harper (Lynton Brent) overhear information about a fictitious gold shipment, and traps some of Steve's men when they attempt a hold-up. Steve packs the jury and his men are set free. Saloon singer Kitty Malone (Claudia Drake), who is in love with Steve, becomes jealous of Flo Vickerk (Christine McIntyre), and warns Johnny that three gunmen have been imported to kill him.