At the end of the 15th century, two minstrels (Gilles and Dominique) come from nowhere into the castle of Baron Hugues. Gilles charms Anne, Hughes' daughter, while Dominique charms both Hugues and Ann's fiancé. Gilles and Dominique are not really in love: they are sent by the Devil to desperate people. But Ann is so pure that Gilles is caught to his own trap. How will they fight against the Devil?
One of the reasons that the film was such a huge success was due to murmuring before the film was released that the film was an allegory for the current situation. Many people saw the character of the Devil as representing Hitler and the continued beating hearts of the lovers as representing France living under German rule, but not giving up hope. Carné maintained until his death that the film was not an intentional allegory for the war and that any relationship was purely unconscious.
As far as French fantasy films go, this is not the greatest one out there. For me, that would probably be "Donkeyskin". But this does have a few things going for it. One, it is much earlier than "Donkeyskin", so has the advantage of being first. Two, it has the Devil, which rises it from fantasy or fairy tale to a more religious context, meaning that deeper symbolism can be found (whether intended or not).
But I think its best quality is the association with Hitler that the Devil has, as noted above. I am willing to believe this was not intentional. But it does seem like a great message to get out of a film made during the occupation... this is a country of Frenchmen who had to keep their French pride in check. That turns this into a patriotic film, even if it has nothing to do with 20th century France on the surface.
