France, 1304. The widow Agnès de Suarcy miraculously escaped death in the dungeons of the Inquisition. But even though her tormentor is dead, she is still in danger. The powerful cardinal wants the death of Agnes and her child, he hires a beautiful assassin, who first goes to the abbey, where several nuns and the mother abbess have already died from poison. Now no one will interfere steal secret documents. The poisoner does not know that she herself will become a victim...