Description :
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
Genre :
Adventure, Crime, Drama, Mystery, Romance,
Casting :
William Hall , Jane Wyman , Esther Ralston , Robert Warwick , Leon Ames , Ben Alexander , Don Barclay , Egon Brecher , Paul Sutton , Jack Mulhall , LeRoy Mason , Harry Woods , Phillip Trent , Lester Dorr , Pat Gleason , Eddie Gribbon ,