The Third Alibi

Laurence Payne Norman Martell

Patricia Dainton Helen Martell

Jane Griffiths Peggy Hill

Edward Underdown Dr. Peter Murdoch

John Arnatt Supt. Ross

Humphrey Lestocq Simmons, the Producer

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)

Richard Neller Sleeping Man in Theater (uncredited)

Pat Ryan Detective Examining Tape-Recorder (uncredited)

Stuart Saunders Cinema manager (uncredited)

Arthur Skinner Det. Sgt. Carter (uncredited)