In a convent, a nun dies in the arms of a boarder, Corinne Leblanc, a former prisoner with a heavy criminal record. The victim, Sister Bénédicte, 39, succumbed to paralysis of the respiratory tract, probably caused by the ingestion of belladonna. At the same time, Lucie, Commander Marquand's daughter, is hospitalized following a suicide attempt, while she is pregnant.
