[Aperion]

The Spiral Staircase

http://www.imdb.com/title/tt0038975/

Excellent, I loved it. This movie definitely influenced giallo films, with the black gloves on the killer to the brandy everyone seems to be drinking. I can tell it also influenced many modern slasher movies but the difference is this is a really good film, with great acting, sets and cinematography. Its even got a Barrymore in it so how can you go wrong?