Love Letters of a Portuguese Nun (1977)

16-year-old Maria is forced into Serra D'Aires convent, secretly run by Satanists.

Director: Jesús Franco

Cast: Susan Hemingway, William Berger, Herbert Fux, Ana Zanatti, Aida Vargas, Vítor Mendes, Aida Gouveia, Herman José, José Viana, Patrícia Leal, Victor de Sousa, Nicolau Breyner, Clara Marabuto, Esther Studer, Dagmar Bürger, Anton Diffring