Behind Convent Walls (1978)

"Behind Convent Walls" is a 1978 Drama movie directed by Walerian Borowczyk and starring by Marina Pierro, Ligia Branice. A zealous, handsome priest, who is the confessor for a convent full of women, encourages the equally zealous abbess of the institution to enforce strict rules on these unfortunate women. At the same time, a particularly disturbed nun manages to poison herself and many of the other novitiates in yet another scandal which is covered up by church authorities.