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Making his debut with Warner Brothers, Henry Fonda plays an apprentice high-voltage lineman working with the no-nonsense, but very experienced Pat O'Brien. Stringing up the high-tension electrical wires on tall metal towers is dangerous work, but from the moment he sees the linemen at work, farm boy Slim (Fonda) knows that this is the job for him. He convinces crew-boss Red Blayd (O'Brien) of this and after heavy-duty training, and the overcoming of a few fears, he starts to work. Tensions arise when Fonda falls in love with Blayd's gal Cally (Margaret Lindsey). Much of the plot was drawn from Tiger Shark (1932).