Counterspy Meets Scotland Yard (1950)

I actually like these movies, they're quick and sometimes quite entertaining.

Ron Randell plays a Scotland Yard inspector working in the US to help find out who is leaking government secrets at a missile testing ground to the Russians. The American agent investigating purportedly committed suicide, but further investigation proves that he was murdered and that it was set up to look like suicide.

The leak is revealed to the audience fairly quickly, and she doesn't know she's a leak. It's none other than Amanda Blake in her pre-Gunsmoke "Miss Kitty" days. She and the star, Ron Randell, became engaged during this time, though they never married.

Black and white, pretty good, and I could listen to Ron Randell talk forever. What a voice.