- Writer:
- Colin Morris
- Designer:
- Raymond London
- Producer:
- Colin Morris
- Director:
- Douglas Camfield
- Det.-Con. John:
- Bernard G. High
- Det.-Sgt. Stone:
- John Slater
- Mr. Lake:
- Martin Wyldeck
- Mrs. Lake:
- Ruth Gower
- Det.-Insp. Hudson:
- John Barrie
- Night-watchman:
- Barrie Fletcher
- Det.-Con. Syd Jones:
- Alan Partington
- Stall-holder:
- Jack Le White
- Ron:
- Jon Finch
- Martin:
- Terence Woodfield
- First woman:
- Terri Ansell
- Second woman:
- Maisy Merry
- Third woman:
- Dorothy Watson
- Mrs. Blacker:
- Hazel Bainbridge
- Mr. Blacker:
- Derek Benfield
- Third detective:
- John Newman
- Ava:
- Hilary Martyn
- Policeman:
- Joseph O'Connell
- Charlie:
- John Garrie
