The Spy Ring
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.
- genus: Adventure, Crime, Drama, Mystery, Romance
- Studio: Universal Pictures
- keyword: spy, polo
- cast: William Hall, Jane Wyman, Esther Ralston, Robert Warwick, Leon Ames, Ben Alexander