Laurence Payne
Norman Martell

Patricia Dainton
Helen Martell

Jane Griffiths
Peggy Hill

Edward Underdown
Dr. Peter Murdoch

John Arnatt
Supt. Ross

Humphrey Lestocq
Simmons

Simmons

Lucy Griffiths
Miss Potter

Olive Milbourne
Mrs. Booth

Arthur Hewlett
Marshall

Annette Kerr
Cinema cashier

Cleo Laine
Cleo

Dudley Moore
Rehearsal Pianist (Uncredited)

Sylvia Davis
Cinema sales girl (uncredited)

Max Faulkner
Det. Sgt. Fred Smith (uncredited)

Garard Green
Patrol car policeman (uncredited)

Arthur Howell
P.C. Williams (uncredited)

Sheila (Party Guest) (uncredited)

Richard Neller
Sleeping Man in Theater (uncredited)

Pat Ryan
Detective Examining Tape-Recorder (uncredited)

Stuart Saunders
Cinema manager (uncredited)