Two American-army officers are working on a new type of machine-gun for anti-aircraft warfare, when one of them is murdered. The other vows to get the spies that are after the invention and avenge his friend's death.
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The Spy Ring (1938) is a adventure movie. Starring William Hall, Jane Wyman, Esther Ralston. Rated 5.6/10 on TMDB. Watch it online free on ZapFlix.