Elenco - The Third Alibi
Laurence Payne
Norman MartellPatricia Dainton
Helen MartellJane Griffiths
Peggy HillEdward Underdown
Dr. Peter MurdochJohn Arnatt
Supt. RossHumphrey Lestocq
Simmons, the ProducerLucy Griffiths
Miss PotterOlive Milbourne
Mrs. BoothArthur Hewlett
MarshallAnnette Kerr
Cinema cashierCleo Laine
CleoDudley 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)Aileen Lewis
Sheila (Party Guest) (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)John Tatham
Detective / Fingerprints Officer (uncredited)