Based on a novel by English author Dennis Wheatley, the picture makes a few too many pretensions to serious exploration of the occult, that hamper the flow.
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Chicago Sun-Times by Roger Ebert
The screenplay has so many characters, and they're in so many different places, that the only way to keep them halfway straight is for them to be calling each other all the time. There are even several scenes in which the phone rings and no one's at home. No one of this Earth, anyway.