A killer known as '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.
| role | name |
|---|---|
| Detective Inspector Jack Viner | Edward Underdown |
| The Dark Man | Maxwell Reed |
| Molly Lester | Natasha Parry |
| Superintendent of Police (Harry) | William Hartnell |
| Carol Burns | Barbara Murray |
| Charles Burns | Robert Long |
| Samuel Denny | Cyril Smith |
| Detective Sergeant Evans | Leonard White |
| Mostyn | Ernest Haines |
| Commander (Scotland Yard) | Walter Horsbrugh |
| role | name |
|---|---|
| Director | Jeffrey Dell |
| Producer | Julian Wintle |
| Composer | Hubert Clifford |
| Editor | Geoffrey Muller |
