The Spy Ring 1938

Synopsis:

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.

Directed by: Joseph H. Lewis
Written by: George Waggner
Runtime: 61 minutes
Tagline: Plotters Gamble Death for Anti-Aircraft Secrets!
Cast:
William Hall
William Hall
Capt. Todd Hayden 
Jane Wyman
Jane Wyman
Elaine Burdette 
Esther Ralston
Esther Ralston
Jean Bruce (as Jane Carleton) 
Robert Warwick
Robert Warwick
Col. Burdette 
Leon Ames
Leon Ames
Frank Denton 
Ben Alexander
Ben Alexander
Capt. Don Mayhew