- Author:
- Edgar Wallace
- Producer:
- Royston Morley
- Div. Det. Insp. Wembury:
- Wallace Douglas
- Central Det. Insp. Bliss:
- Edmund Willard
- Colonel Walford:
- Gerald Case
- Samuel Hackitt:
- Wally Patch
- Maurice Meister:
- Franklin Dyall
- Dr Lomond:
- D.A. Clarke-Smith
- Cora Ann Milton:
- Dorothy Dickson
- Mary Lenley:
- Sheila Sim
- John Lenley:
- Leonard Sachs
- Station Sergeant Carter:
- Clifford Buckton
- Benny:
- Peter Ashmore
- Mrs Hackitt:
- Marjorie Rhodes
- Policemen and Detectives:
- George Stanford
- Policemen and Detectives:
- John Schofield
- Policemen and Detectives:
- John Palmer Roberts
- Policemen and Detectives:
- Morgan Griffiths
