A killer called 'The Dark Man' commits double murder. This is witnessed by the young aspiring actress Molly Lester. The Dark Man tries everything to put Molly out of the way. Detective Inspector Viner of Scotland Yard investigates the murders.
Edward Underdown
as Detective Inspector Viner
Maxwell Reed
as The Dark Man
Natasha Parry
as Molly
William Hartnell
as Superintendent of Police
Barbara Murray
as Carol Burns
Robert Long
as Charles Burns
Cyril Smith
as Samuel Denny
Leonard White
as Detective Sergeant Evans
Ernest Haines
as Mostyn
