A diabolical woman, now in her seventies, Marie Maurestier enjoys the reputation of a murderer for having poisoned, during her life, three wealthy husbands. In front of this black lady, justice had to surrender and the woman lives her life quietly in the small community of Saint Sorlin en Bugey, flaunting swagger. It will be the arrival of the young Gabriel, the new parish priest, that will reawaken the powerful life-giving energy of Marie who, determined to possess him, builds a very daring trap, besieging the unwary priest with the slowness, patience and concentration of a very poisonous spider.
