Though he doesn't wield a sword nor wear a plumed hat, singing cowboy Rex Allen qualifies as The Last Musketeer in this Republic western. Allen is called upon to stem the underhanded activities of land baron Russ Tasker (James Anderson). It is Tasker's intention to buy up all the local farmland dirt cheap, so that he can reap all the revenue engendered by an upcoming dam project. The villain is none too particular about his methods, going so far as to cut off all water supplies so that the ranchers' cattle will die off. But Allen finds a method to thwart Tasker's scheme--and without resorting to firearms or fisticuffs. Rex Allen's singing talents are spotlighted during two musical sequences, in which he is backed up by comic sidekick Slim Pickens and The Republic Rhythm Riders.