Geronimo1967
I thought for a moment it was Gale Sondergaard under the bejewelled crown, but no - it's Jeanne Moreau as the eponymous lady who charms the pants, literally, from the French soldiers from whom she exacts more than kisses. She lives well on the proceeds of her courtesanship, but she also augments that cash by working for the Bosch towards the end of the Great War enabling them to acquire useful French state secrets. She is cold and calculating until she encounters "Lasalle" (Jean-Louis Trintignant). There's something about him that permeates her hitherto impervious armour, and though that doesn't stop her using him, unusually she begins to care. That's dangerous thing for both of them, and when he discovers that she is still trying to tap up...