Shot in 1944 entirely in French (version seen has English subtitles), in style rather like a short section of a budget version of his "Lady Vanishes", it must have been intended for clandestine distribution in occupied and Vichy France. For this reason and the fact that it appears to have a clear practical purpose it presumably is a training film. It is thus not primarily a tribute to the French Resistance, its purpose seems instead to be to warn them of a dangerous new Gestapo method of infiltration. Hitchcock's contribution was to make the message clear and hold the attention.
It concerns the return to England of a British air-gunner (played by English actor John Blythe in French) recently escaped from a German prisoner of war camp. He has safely arrived back in London due to the help he received from the French Resistance and is being de-briefed by French exile officers. What should though have been a happy conclusion to a successful escape is soured when the true tragic facts are revealed to him that he has been an innocent pawn in a dastardly Gestapo design for the infiltration of the French resistance network. In this he was made a carrier of something deadly - not disease but something similarly poisonous - that he had been made to unwittingly expose members of the Resistance. One guesses that the main purpose of the film was to warn everyone of this.
It concerns the return to England of a British air-gunner (played by English actor John Blythe in French) recently escaped from a German prisoner of war camp. He has safely arrived back in London due to the help he received from the French Resistance and is being de-briefed by French exile officers. What should though have been a happy conclusion to a successful escape is soured when the true tragic facts are revealed to him that he has been an innocent pawn in a dastardly Gestapo design for the infiltration of the French resistance network. In this he was made a carrier of something deadly - not disease but something similarly poisonous - that he had been made to unwittingly expose members of the Resistance. One guesses that the main purpose of the film was to warn everyone of this.