A group of hip friends gather at a Gothic castle owned by a wheelchair- bound older relative of one of the girls (Isabella Marchall). One couple in the group, unbeknownst to the others, is smuggling heroin in some Chinese artifacts the protagonist has brought back from the Orient to give to her elderly relative. Meanwhile the deranged uncle of the protagonist, who supposedly killed the protagonist's mother (his own sister)and cut out her eyes, is wandering the catacombs spying on everyone. When one of the guests (Patrizia Gorzi) is murdered and her eyes subsequently disappear, suspicion naturally falls on the mad uncle. But is he being set up?
The plot here is actually pretty lame. There's also a real lack of recognizable acting talent compared to other gialli. (Patrizia Gorzi had been in "Emanuelle's Revenge" and "Possessor", but she only has a small part and the rest of the cast are virtual unknowns). The eyeball murders are gory but pretty low-tech and nothing to write home about frankly. This movie has style to burn though, and that's where it really succeeds. The old castle makes for an interesting setting. The visual are top-notch (with very good cinematography and editing) and the music is very memorable. In some ways it's kind of an old-fashioned Gothic horror movie (like "Tomb of Torture" or "The Virgin of Nuremberg"), but definitely with a late 70's sensibility as far as sex and gore go.
Gialli were really never known for their great plotting, but for their visual style and music. And if you compare this movie to "Sister of Ursula" the next year and "Play Motel" the year after that, it's clear that the genre faded not so much because the stories got dumber (or because they basically turned into softcore porn flicks), but because their unique style slowly drained away over the years. As far as a late 70's gialli goes this is actually pretty good. I'd recommend to giallo fans at least if no one else.