Cast
Humphrey Lestocq
Simmons, the Producer
Lucy Griffiths
Miss Potter
Cleo Laine
Cleo
Jane Griffiths
Peggy Hill
Stuart Saunders
Cinema manager (uncredited)
Laurence Payne
Norman Martell
John Arnatt
Supt. Ross
Pat Ryan
Detective Examining Tape-Recorder (uncredited)
Patricia Dainton
Helen Martell
Arthur Hewlett
Marshall
Annette Kerr
Cinema cashier
Dudley Moore
Rehearsal Pianist (Uncredited)
Max Faulkner
Det. Sgt. Fred Smith (uncredited)
Edward Underdown
Dr. Peter Murdoch