A composer (Laurence Payne) is stuck in a middle-class marriage and finds that his affair with his wife's half-sister (Jane Griffiths) has resulted in a pregnancy. When his wife refuses to give him a divorce he hatches a murder scheme that is too clever by half.
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)