The Spy Ring (1938) is a Adventure, Crime, Drama, Mystery, Romance film that follows 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. The Spy Ring is not currently listed with streaming providers in your selected region, but availability can change over time. It has a user rating of 4.5 out of 10 from 4 votes. Fans of adventure movies may also want to explore similar titles below.