- Author:
- Anthony Berkeley
- Dramatised by:
- John Keir Cross
- Production:
- Frederick Bradnum
- Storyteller:
- Norman Claridge
- Roger Sheringham:
- William Fox
- Crystal Vane:
- Cecile Chevreau
- Guy Pidgeon:
- Geoffrey Wincott
- Valentine Combe:
- Douglas Storm
- Willie Fayre:
- Harold Reese
- Enid Fayre:
- Margaret Wolfit
- Unity Vincent:
- Mary Law
- Stella Crosspatrick:
- Jane Jordan Rogers
- Lady Darracott:
- Joan Matheson
- Angela St Thomas:
- Judy Bailey
- Mrs Bray:
- Catherine Salkeld
- Mr Bray:
- Jeffrey Segal
- Harold Parker:
- Rolf Lefebvre
- Captain Twyford:
- William Eedle
- Sir John Birch:
- Leigh Crutchley