Laurence Payne as Norman Martell

Patricia Dainton as Helen Martell

Jane Griffiths as Peggy Hill

Edward Underdown as Dr. Peter Murdoch

John Arnatt as Supt. Ross

Humphrey Lestocq as Simmons, the Producer

Lucy Griffiths as Miss Potter

Olive Milbourne as Mrs. Booth

Arthur Hewlett as Marshall

Annette Kerr as Cinema cashier

Cleo Laine as Cleo

Dudley Moore as Rehearsal Pianist (Uncredited)

Sylvia Davis as Cinema sales girl (uncredited)

Max Faulkner as Det. Sgt. Fred Smith (uncredited)

Garard Green as Patrol car policeman (uncredited)

Arthur Howell as P.C. Williams (uncredited)

Aileen Lewis as Sheila (Party Guest) (uncredited)

Richard Neller as Sleeping Man in Theater (uncredited)

Pat Ryan as Detective Examining Tape-Recorder (uncredited)

Stuart Saunders as Cinema manager (uncredited)

Arthur Skinner as Det. Sgt. Carter (uncredited)

John Tatham as Detective / Fingerprints Officer (uncredited)