Counterspy Meets Scotland Yard

Counterspy Meets Scotland Yard is a 1950 American film noir crime film starring Howard St. John, Ron Randell and Amanda Blake. It was directed by Seymour Friedman. A Scotland Yard inspector working in the United States helps the American authorities track down a leak at a missile base by enemy agents.
It was one of several B movies Ron Randell starred in at Columbia.
Plot.
When enemy agents obtain leaked secrets about a guided missile reservation, the chief of America's counterspy division (Howard St. John) and Scotland Yard's best investigator Ron Randell get on an investigative trail which quickly leads to a reservation secretary (Gunsmoke's Miss Kitty, Amanda Blake). "Suspense and excitement"--Harrison's Reports.