Based on a Zane Grey story, The Last Trail stars virile cowboy hero George O'Brien in a largely anti-heroic role. Escaping from a posse, the "good bad man" (O'Brien) boards an Eastbound train, where he strikes up a friendship with a genial gangster (J. Carroll Naish). Later on, the cowboy returns to the West as a member of the gangster's gang. He poses as the heir to a vast cattle ranch, never dreaming that he really is the heir. When the truth is revealed, the wayward cowboy switches to the side
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