Poorly made spy rubbish about an attempt by Nazi agents to kill FDR at the Teheran Conference. Looks like someone read an Eric Ambler novel and decided to make a spy movie, while neglecting important things, like the script. Farr is no one's idea of an action hero and Labarr is a cold fish. Only Whiley's villain and Slater's stereotypical Soviet have any life, and in a good movie, they would be considered the worst bits. Interesting as an example of early postwar film making, but nothing else.
Note: Marta Labarr is not credited on the print used.