- Author:
- Nicholas Blake
- Adapted by:
- Mollie Greenhalgh
- Producer:
- Archie Campbell
- The Rev. Percival Vale (Headmaster of Sudeley Hall Preparatory School):
- Wilfred Babbage
- Hero Vale his wife:
- June Tobin
- Michael Evans, a master:
- Andrew Faulds
- Other masters at Sudeley Hall - Mr Gadsby:
- Eric Phillips
- Other masters at Sudeley Hall - Mr Wrench:
- John Rye
- Other masters at Sudeley Hall - Mr Sims:
- Cyril Shaps
- Other masters at Sudeley Hall - Mr Tiverton:
- Hugh Dickson
- Other masters at Sudeley Hall - Mr Griffin:
- Denis Goacher
- Boys - Ponsonby:
- Derek Meeds
- Boys - Stevens Minor:
- Jonathan Margetta
- Boys - Smithers:
- Nigel Anthony
- Superintendent Armstrong, of the local police:
- Douglas Storm
- Sergeant Pearson, his assistant:
- Bill Horsley
- Nigel Strangeways, a private detective:
- Nigel Stock
- Dr Maddox, the School Medical Officer:
- Norman Claridge
