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.

• Tempean Films
• Forrest Tucker
• Jennifer Jayne
• Janet Munro
• Laurence Payne
• Warren Mitchell
• Frederick Schiller
• Colin Douglas
• Andrew Faulds