It's hard-rock mining and rock-hard brawling as the Derby Man takes on a boom town. A man could mine fabulous wealth on the Comstock but Darby Buckingham strikes only a mother lode of trouble. With his sledgehammer fists and sharply honed wits, Darby sets out to expose a spellbinding stock manipulator. Rigging a boxing match that becomes a nightmare of punishment, sabotaging a mine shaft into a pit of death - Darby's rattle-snake of an opponent baits him ruthlessly. Yet like an enraged bear, the Derby Man comes roaring into action.