Jeff Burton (Dennis O'Keefe), young prizefighter, stops in Brimstone, Arizona on his way home to San Diego from New Jersey, after the stagecoach he was ring in was held up by Trigger Bill (Wallace Berry), outlaw boss of Brimstone. Bill, through a picture in the back of Jeff's watch discovers Jeff to be his long-lost son. He protects Jeff through difficult times and, unknown to Jeff, provides the money to send him to law school. Jeff later returns as a federal marshal and , aided by Bill, cleans up the lawless town.