While traveling through Bavaria, British hunter Walter Pidgeon, playing "Thorndike," unexpectedly finds Adolf Hitler in his rifle’s sights. He's quickly arrested by the Nazis and subjected to torture at the hands of “Quive-Smith” (George Sanders), who wants him to sign a false statement claiming he was sent by Britain to kill their leader. Fortunately for "Thorndike," his brother holds the position of British Ambassador, making it more difficult for them to simply eliminate him. "Quive-Smith" then plots to make his death appear as an accident during a hunt, but “Thorndike” manages to escape and returns to Britain, only to find that his enemy is still pursuing him. He seeks refuge in the apartment of the young “Jerry” (Joan Bennett), and together they struggle to stay ahead of the Gestapo’s relentless pursuit. Eventually, his brother suggests leaving the UK might be his best option, leading to a clever plan involving hiding out in a cave. However, he doesn't realize that his enemy has captured his friend and is now blocking him inside the cave, demanding the signed confession as the price for her release... This is an excellent wartime thriller distinguished by its unique storyline, strong performances from Pidgeon and Sanders, and solid writing. It provides a more refined perspective on how espionage might have operated before World War II—the document’s purpose being to pressure Britain into inaction when Germany invaded Poland. The narrative progresses at a brisk pace; Bennett brings a spirited quality to her appearances, and there's plenty of action – even an electrocution on the Underground - to keep things moving along smoothly. It's definitely worth watching if you enjoy this type of film—made during the early years of World War II, it still conveys a sense of honor among enemies that would soon disappear.

Source on TMDB