Virginia de Leyva, daughter of a Spanish Lord, becomes a nun in Monza, in 1600s. She becomes very strict with herself and the students until she's unable to resist a romance with the nobleman Gian Paolo Osio which will lead both to danger.
| Actor | Role |
|---|---|
 Giovanna RalliVirginia de Leyva | Virginia de Leyva |
 Gabriele FerzettiGian Paolo Osio | Gian Paolo Osio |
 Mario FelicianiDon Martino de Leyva | Don Martino de Leyva |
 Lilla BrignoneDonna Marianna | Donna Marianna |
 Gino CerviCardinale Borromeo | Cardinale Borromeo |
 Emma GramaticaBadessa Anziana | Badessa Anziana |
 Evi MaltagliatiBadessa Inbeserco | Badessa Inbeserco |
 Elisa CeganiLa Monaca Portinaia | La Monaca Portinaia |
 Corrado PaniMolteno | Molteno |
| GGiulia RubiniBenedetta | Benedetta |
| RRosy MazzacuratiOttavia | Ottavia |
 Fosco GiachettiMonsignor Barca | Monsignor Barca |
 Hélène ChanelCaterina | Caterina |
 Alberto LupoGiudice | Giudice |
 Lia ZoppelliLa Governante | La Governante |
 Robert PorteCarlo | Carlo |
 Sandro PistoliniLorenzo | Lorenzo |
 Marcello GiordaNot listed | Not listed |
 Luciano PigozziNot listed | Not listed |