A tough nun (Anna Massey) demands belief and obedience from convent schoolgirls (Katrin Cartlidge, Oona Kirsch) in World War II England.
| Actor | Role |
|---|---|
 Anna MasseySister Thomas | Sister Thomas |
 Katrin CartlidgeDoris | Doris |
| OOona KirschMaggie | Maggie |
 Fiona ShawSister Felicity | Sister Felicity |
 Anne DysonSister Perpetua | Sister Perpetua |
 Gerard MurphyFather Larkin | Father Larkin |
 Annette BadlandSister Mercy | Sister Mercy |
| SSadie WearingMary | Mary |
| AAnne-Marie GwatkinLizzie | Lizzie |
 Kathy BurkeTillie | Tillie |
 Jenna RussellKate | Kate |
 Murray MelvinFather Power | Father Power |
 John BettDoctor Taylor | Doctor Taylor |
| NNicholas DonovanMajor Manley | Major Manley |
| FFred BryantWarden Rodgers | Warden Rodgers |
| CCatherine TerrisMiss Blundell | Miss Blundell |
 Alan RenwickTommy #1 | Tommy #1 |
| KKevin QuarmbyTommy #2 | Tommy #2 |
| CCyril AppletonPlumber | Plumber |
| IIan StaplesGerman Soldier | German Soldier |
| TTrudy HowsonNun #1 | Nun #1 |
 Elizabeth RiderNun #2 | Nun #2 |
 Richard BebbRadio Announcer (voice) | Radio Announcer (voice) |