Sister Emanuelle 

1977

Emanuelle has decided that her past was full of debauchery and sin, so she enters a nunnery (an absolutely stunning Italian castle). She's asked to chaperone a young girl (Mónica Zanchi), who makes Emanuelle question her own life and religious dedication. Gabriele Tinti plays the escaped killer that creates chaos at the convent. Films such as Sister Emanuelle are what make the Black Emanuelle series so unique: it gives the actors some variety in their roles and really explores some different ideas. A highly recommended entry.