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