It stars Ralph Bellamy, Fay Wray, and Regis Toomey, and was released on December 29, 1938.

Undercover secret agents John Baxter and Ted Hall apprehend a foreign spy at a factory, but he is shot by Steve Corben.

During the testing of a new chemical weapon, Ted fakes his death while John impersonates the gas's inventor Professor Leonard and feigns a mental breakdown.

John and Eleanor, who pretends to be Leonard's sisters, admit themselves into the spy ring's sanatorium to gather intelligence but are discovered and captured.

They escape by throwing acid from the laboratory at their captors before the D.C. Metropolitan Police Department surrounds the building.