1939 was a good year for movies. It was at the end of this year that England declared war on Germany so no one could have predicted the outcome. You can get a feel for the time and events by watching Mrs. Miniver (1942). Laurence Olivier is the head pilot for an aeroplane test firm. Planes are missing from the test of a new turbocharger. The use of Marconi's ray in the movie has shades of EMP (electromagnetic pulse) and looks like a particle beam generator that we are perfecting today for our anti-ballistic missile defenses system.
Aside from being a great spy movie, there is a love interest (Valerie Hobson) that does not overwhelm the story. And we see the mysterious workings of the intelligence service (Ralph Richardson).
Aside from being a great spy movie, there is a love interest (Valerie Hobson) that does not overwhelm the story. And we see the mysterious workings of the intelligence service (Ralph Richardson).