A Blade in the Dark (AKA The House with the Dark Staircase ~ 1983)
Italian giallo/horror directed by Lamberto Bava. A young musician named Bruno (Andrea Occhipinti) is commissioned to write the score for a new horror film. He rents a large villa for a few weeks to help put him in the right frame of mind, and where he can work without his music disturbing anyone. But he soon starts to find things he can't explain, such as strange background voices on tape recordings of him playing, a metronome that seems to switch itself on when he's out of the room, and pages of his softcore porn magazine slashed by a knife when left in the same room. He also encounters - separately - two young women who say 'Linda' (the previous occupier) used to let them use the pool. He agrees to let them continue, but both women disappear soon after he meets them. Obvious fresh bloodstains in the building and grounds lead him to believe the women have been murdered (which they have). Sandra (Anny Papa), the director of the film he's scoring, admits that her story is inspired by events that happened to someone she knew named 'Linda' and she suspects that may be the same 'Linda' who previously occupied the villa. Bruno believes the answers to everything may be contained in the ending to Sandra's film - but Sandra won't let anybody view it or know what it contains...
The atmosphere in this is fantastic, and for the most part it's truly gripping. Bava creates such a subtle sense of creeping unease - but has no problem at all in also showing sudden, bloody injury and death when it's called for. One terrifically brutal kill is an all-time hall-of-famer. The performances are all good, the score (which also serves as the score Bruno is creating for Sandra's film) is great, and the women are all drop-dead gorgeous The movie does fall off a bit towards the end, and unfortunately what's really going on is blindingly obvious very early on; but the strength of the first three quarters still gets it an 8/10. Incidentally, there are two cuts of this, one 97 min and one 109 min. The 109 min is the one to go for (the film was originally made as a four-part TV mini-series; when the network decided it was too violent, it was trimmed down and released as a 97 min feature instead. The 109 min version has all that trimmed footage restored - including some which makes that death I mentioned even more sadistic and drawn out!). Some topless nudity.