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A mute young woman is stalked by a serial killer at her uncle's mansion.
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Cast
- Jacqueline BissetHelen Mallory
- Christopher PlummerDr. Joe Sherman
- John Phillip LawSteven Sherman
- Sam WanamakerLieut. Fields
- Mildred DunnockMrs. Sherman
- Gayle HunnicuttBlanche
- Elaine StritchNurse Baker
- John RonaneDr. Rawley
- Sheila BrennanMrs. Oates
- Ronald RaddOates
Crew
- Peter CollinsonDirector
- Allan ScottScreenplay
- Chris BryantScreenplay
- Ethel Lina WhiteNovel
- Ken HodgesDirector of Photography
- David LindupOriginal Music Composer
- Raymond PoultonEditor
- Peter ShawProducer
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