| Barbara Payton | ... | Lena / Helen | |
| James Hayter | ... | Dr. Harvey | |
| Stephen Murray | ... | Bill | |
| John Van Eyssen | ... | Robin | |
| Percy Marmont | ... | Sir Walter | |
| Jennifer Dearman | ... | Lena as a Child | |
| Glyn Dearman | ... | Bill as a Child | |
| Sean Barrett | ... | Robin as a Child | |
| Kynaston Reeves | ... | Lord Grant | |
| John Stuart | ... | Solicitor | |
| Edith Saville | ... | Lady Grant |
Directed by | |||
| Terence Fisher | |||
Writing credits(in alphabetical order) | ||
| Terence Fisher | screenplay | |
| Paul Tabori | adaptation and screenplay | |
| William F. Temple | novel "Four-Sided Triangle" | |
Produced by | |||
| Michael Carreras | .... | producer | |
| Alexander Paal | .... | producer | |
Original Music by | |||
| Malcolm Arnold | |||
Cinematography by | |||
| Reginald H. Wyer | |||
Film Editing by | |||
| Maurice Rootes | |||
Art Direction by | |||
| J. Elder Wills | |||
Makeup Department | |||
| Dick Bonnor-Morris | .... | makeup artist | |
| Nina Broe | .... | hair stylist | |
Production Management | |||
| Victor Wark | .... | production manager | |
Second Unit Director or Assistant Director | |||
| Bill Shore | .... | assistant director | |
| Aida Young | .... | second assistant director (uncredited) | |
Sound Department | |||
| Bill Salter | .... | sound recordist | |
| Percy Britten | .... | sound recordist (uncredited) | |
Camera and Electrical Department | |||
| Len Harris | .... | camera operator | |
| Tom Friswell | .... | clapper loader (uncredited) | |
| John Jay | .... | still photographer (uncredited) | |
| Manny Yospa | .... | focus puller (uncredited) | |
Editorial Department | |||
| Bill Lenny | .... | first assistant editor (uncredited) | |
Music Department | |||
| Muir Mathieson | .... | conductor | |
Other crew | |||
| Renée Glynne | .... | continuity | |
| Nora Roberts | .... | dialogue director | |
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| The Two Faces of Dr. Jekyll | Batman Forever | Diamonds Are Forever | The Tunnel of Love | Horror of Dracula |
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| Full cast and crew | Company credits | External reviews |
| News articles | IMDb Romance section | IMDb UK section |
Early Hammer sci-fi, which is nicely enough made, just avoiding being too sentimental about the rolling hills of old England, but not having quite the edge that would have made it so much better. Difficult enough after the war to discuss suicide so openly without taking too cynical a view on life and death generally but it is the end that really disappoints. I won't spoil the ending but am convinced this could have been a real chiller. Nevertheless, everyone turns out decent performances with Barbara Payton being particularly effective in her twin roles. Well shot and helped much by Malcolm Arnold soundtrack. Worth seeing and despite obvious precedents, original enough in its own way.