A reporter is asked to look into the mysterious death of a nun who died in a locked room at a convent. She had recently inherited a fortune. The reporter next leans off an apparition that haunts the hallways at night and seems to portend death. Flashlight in hand, she goes off in search of the "Black Nun."
| Actor | Role |
|---|---|
 Maria AitkenJemima Shore | Jemima Shore |
 Renée AshersonMother Ancilla | Mother Ancilla |
| SSusan EngelSister Agnes | Sister Agnes |
 Brenda BruceSister Elizabeth | Sister Elizabeth |
| SSylvia ColeridgeSister Boniface | Sister Boniface |
 Doran GodwinSister Lucy | Sister Lucy |
| MMargaret D'ArcySister Clare | Sister Clare |
 Patsy KensitTessa | Tessa |
| CCatrina Hylton-HullMandy | Mandy |
 James LaurensonAlexander Skarbek | Alexander Skarbek |
| LLinda SlaterDodo | Dodo |
| SSarah WebbMargaret | Margaret |
 Michèle WinstanleyBlanche | Blanche |
 Elvi HaleLady Polly | Lady Polly |
| JJohn BryansSir Charles | Sir Charles |
 David BurkeTom Amyas M.P. | Tom Amyas M.P. |
 Mary HealeyBeatrice O'Dowd | Beatrice O'Dowd |
| RRonald MayerDr. Mayhew | Dr. Mayhew |
| KKate BinchySister Edward | Sister Edward |
| JJames ApplebyJoe | Joe |