I noticed a discrepancy with the running time of the version of this film I downloaded for free at archive.org--it runs 81 minutes, not 86. IMDb says there's a severely truncated version at 65 minutes...but this one I saw was missing only five minutes or the running time listed on IMDb is incorrect.
When the film begins, Susan (Carla Lehmann) awakens in a hospital bed as there are celebrations for the combined Allied landing in North Africa. The film then jumps back to before this and explains what exactly had happened to Susan.
A desperate escaped POW takes shelter in Susan's home in Algeria. At this point, the Vichy French and Americans were not at war with each other and so despite the Vichy being essentially a vassal state to the Nazis, American nationals are allowed in this part of France even though the US and Germany are at war. So, if Susan wanted to, she simply could have turned in Alan (James Mason) and been safe. But instead he soon convinces her to help him obtain a camera filled with important film...film which COULD hamper the Americans and Free French from invading North Africa. And, as a result of her choice, Susan is in almost constant peril.
This is a pretty exciting war film--one obviously meant to drum up sentiment in favor of the Allied cause. While technically this is a propaganda film, it's a good one and doesn't come off as jingoistic or which depicts the Germans as monsters like many other films. Because of this, it holds up pretty well, though most viewers today might not understand the context for the film--such as what was Vichy France and how were the Free French very different. Still, an enjoyable little film. Oh, and although it doesn't matter, the American lady, Susan, was played by a Canadian. And, there also is a bit of a plot hole as the film really did NOT explain why Susan was in the hospital--particularly as just before this she seemed healthy and just fine on the ship. Odd...as was the ending, though that was odd in an enjoyable sense.