"Philip Elliot, a refugee Belgian priest, reports to a secret school in London for spies and saboteurs behind German lines. After training, he and two others parachute into Belgium to help destroy a records office. This mission leads to German capture of an important resistance leader, and four more agents go in on a rescue mission. But one of them is a traitor; and other things go wrong." This is pretty much par for the course for war flicks of the day so it's not very rememberable to he honest. You can catch the original one on Plex so give it a go.
Worth a once over,