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