A United Nations investigator crosses paths with a pair of psychic sisters on his way to Trollenberg observatory in the Swiss Alps, which has been plagued by a series of mountaineer disappearances that may be related to a radioactive cloud at the mountain's south face.
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| Directing | Quentin Lawrence | Director |
| Writing | Jimmy Sangster | Screenplay |
| Sound | Stanley Black | Original Music Composer |
| Production | Monty Berman | Producer |
| Editing | Henry Richardson | Editor |
| Production | Robert S. Baker | Producer |
| Camera | Monty Berman | Director of Photography |
| Art | Duncan Sutherland | Art Direction |
| Costume & Make-Up | Eleanor Jones | Makeup Artist |
| Costume & Make-Up | Joy Vigo | Hairstylist |
| Crew | Les Bowie | Special Effects |
| Camera | Desmond Davis | Camera Operator |
| Production | Charles Permane | Production Manager |
| Writing | Giles Cooper | Story |
| Writing | George F. Kerr | Story |
| Writing | Jack Cross | Story |
| Production | Ronald Liles | Production Supervisor |
| Directing | Norman Harrison | Assistant Director |
| Sound | Dick Smith | Sound Recordist |
| Crew | Brian Johnson | Special Effects Assistant |
| Directing | Yvonne Richards | Continuity |
