Young aspiring actress Molly Lester witnesses a double murder, so its perpetrator, a killer known as The Dark Man, tries everything to maintain her silence.
Edward Underdown
Detective Inspector Viner
Maxwell Reed
The Dark Man
Natasha Parry
Molly
William Hartnell
Superintendent of Police
Barbara Murray
Carol Burns
Robert Long
Charles Burns
Cyril Smith
Samuel Denny
Leonard White
Detective Sergeant Evans
Ernest Haines
Mostyn