The Third Alibi

Norman Martell

Helen Martell

Peggy Hill

Dr. Peter Murdoch

Supt. Ross

Simmons, the Producer

Miss Potter

Mrs. Booth

Marshall

Cinema cashier

Cleo

Rehearsal Pianist (Uncredited)

Cinema sales girl (uncredited)

Det. Sgt. Fred Smith (uncredited)

Patrol car policeman (uncredited)

P.C. Williams (uncredited)

Sleeping Man in Theater (uncredited)

Detective Examining Tape-Recorder (uncredited)

Cinema manager (uncredited)

Det. Sgt. Carter (uncredited)

Detective / Fingerprints Officer (uncredited)