Peeping Tom
Loner Mark Lewis works at a film studio during the day and, at night, takes racy photographs of women. Also he's making a documentary on fear, which involves recording the reactions of victims as he murders them. He befriends Helen, the daughter of the family living in the apartment below his, and he tells her vaguely about the movie he is making.
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About
Peeping Tom (1960) is a crime, horror, thriller movie running 1h 41m. Starring Karlheinz Böhm, Moira Shearer, Anna Massey. Rated 7.5/10 on TMDB. Watch it online free on ZapFlix.