Story of a Cloistered Nun

Story of a Cloistered Nun (Storia di una monaca di clausura, released as Unholy Convent and Diary of a Cloistered Nun) is a 1973 nunsploitation film directed by Domenico Paolella and starring Eleonora Giorgi, Catherine Spaak, Suzy Kendall, Martine Brochard, Tino Carraro, and Umberto Orsini. The film claims to be inspired by real events that occurred in the 16th-century at the Certosa di San Giacomo.

Plot
Refusing an arranged marriage, young aristocrat Carmela Simoni is sent to a convent. Her arrival intensifies the power struggle between the debauched nun Elisabeth, and the stern but Mother Superior, as both are smitten by Carmela's beauty.

Cast
Joan Collins was originally cast as the Mother Superior, but was replaced by Suzy Kendall before filming started.