 | George Nader als Paul Gregory |
 | Maggie Smith als Bridget Howard |
 | Bernard Lee als Victor Sloane, alias Lee Henderson |
 | Geoffrey Keen als Inspector Scott |
 | Bessie Love als Harriet P. Jefferson |
 | Harry H. Corbett als Sullivan |
 | Andrée Melly als Rosa, cocktail waitress |
 | Lionel Jeffries als Pet Shop Owner (uncredited) |
 | Barbara Hicks |
| George Hilsdon |
 | Glyn Houston |
 | Noel Howlett |
 | Oliver Johnston |
| Lily Kann |
| Harry Locke |
 | Howard Marion-Crawford |
| Lane Meddick |
| Charles Price |
 | Maggie Rennie |
 | Guy Standeven |
 | John Welsh |
| Seth Holt | Writer |
| Paul Beeson | Director of Photography |
| Seth Holt | Director |
| Michael Balcon | Producer |
| Kenneth Tynan | Writer |
| Peter Proud | Production Design |
| Chic Waterson | Camera Operator |
| Donald MacKenzie | Novel |
| Harry Aldous | Editor |
| Alan Withy | Art Direction |
| Dizzy Reece | Music |
