When Barry Corvall discovers that his new bride is a possible enemy agent, he resigns from the diplomatic service to go undercover to route out an espionage ring planning to destroy American industrial capability.

Joel McCrea
as Barry Corvall

Brenda Marshall
as Brenda Ballard

Jeffrey Lynn
as Lowell Warrington

Nana Bryant
as Mrs. Corvall

Martin Kosleck
as Karl 'Muller' Mullen

Rudolph Anders
as Paul Strawn (as Robert O. Davis)

James Stephenson
as Dr. Anton Rader

George Bancroft
as Dudley Garrett

Stanley Ridges
as Hamilton Peyton

Howard Hickman
as Walter Forbes