
Renowned criminologist and occult investigator William Sebastian (Culp) recruits his old friend Dr. Hamilton (Young) to aid him in his current case. Anitra Cyon (Bell), the sister of prominent British businessman Geoffrey Cyon (Villiers), believes her brother is dabbling in the black arts. In turn, Geoffrey claims that she is mentally unfit. Sebastian and Hamilton travel to the Cyon estate to investigate the matter. Complicating the issue is Sebastian's debilitating heart condition that was induced by his own experimentations with the black arts.
Carl RiggPoilceman (uncredited)
John HurtMitri Cyon
Majel BarrettLilith
James VilliersSir Geoffrey Cyon
Gig YoungDr. Ham HamiltonThe jet seen in the film, tail number G-BFAN, is a Hawker Siddeley HS 125.700.
Dr. Hamilton:
It's impossible for something to feel evil to the touch. Am I imagining it?
Continuity: Different airplanes are used in different exterior shots of what is supposed to be the same jet. Though they appear to be the same model, they have distinctive markings.
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HalloweenWith more than a million titles, it isn't feasible to handpick recommendations for every film. That's why we came up with a formula to suggest titles that fit along with the selected one. The formula uses factors such as user votes, genre and keywords to generate an automatic response. The system produces relevant results most of the time but since recommended titles are not manually chosen, occasionally they may include less than perfect matches.