A Blade in the Dark (1983)
One of the classics. The italian directors in the 70s & 80s made brilliantly unique movies with rather low budget. Lamberto Bava of course known as the son of the great Mario Bava.
The movie builds a very thrilling atmosphere with simple means and with some true 80s gore scenes. (The blade through the hand -scene being the most impressive and a few more clumsy but loveable 80s style scenes). Music & acting is top notch for all factors considered. Especially the scenes with piano music.
The plot holds more than you first think.
Very solid movie and a must watch for italo-horror lovers.