This drama about the Carmelite order of nuns is set during the French Revolution. A young woman seeks refuge with the Carmelites because she is terrified of dying during the upheaval. The longer she associates with the nuns the more she is transformed by their faith and devotion. 

Strange things are happening in the small town of Breuil-le-Château. Provisions from the black market are stolen regularly and wealthy young men, including the squire's son, start vanishing... Ransom demands are sent but with an illegible signature. The investigation is trusted to Ducreux, the local police brigadier. He is assisted by Carlier, a film director in search of locations for his next movie, who has been mistaken for a police inspector from Paris. The two men will have more than their share of surprises.