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After a supernatural experiment leaves him with a serious heart condition, occult criminologist William Sebastian (Robert Culp) recruits his skeptical friend, Dr. "Ham" Hamilton (Gig Young), to aid him with a new case. Their assignment: to investigate Geoffrey Cyon (Majel Barrett), a British businessman allegedly flirting with the dark arts. As William and Ham learn more about the suspicious Cyon family, they have to fight to survive against a powerful demon and an evil cult. Wikipedia