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Knocked unconscious by Macklin (Maston Williams) and about to drown in the raging river, Clark Stuart (Ray Corrigan) is rescued in the nick of time by juvenile scout wannabe Kit Carson (Sammy McKim). The rest of the wagon train makes it safely across the river but the villainous Macklin manages to escape. Stuart and Kit track him down to the gang's mountain hideout, where they learn that Bull Smith (Charles King) has the Mystery Rider cornered on a plateau. Riding hell bent for leather, Stuart takes up the fight to save the Rider (Julia Thayer), who, to his astonishment, turns out to be a young girl. With Smith and the gang closing in, Stuart and the Rider are forced over a cliff and into the lake below.