Amongst all the malformation, rampant bonking and incest perhaps the strangest thing on offer here is the unusually competent cop character, who not only understood everything but was able to explain it so that I also understood everything.
A film student suspects that a local murder has been inspired by the plot of a Hitchcock movie, he then tediously wanders about an Italy populated by English people and refuses to have sex with his girlfriend until he's proven right. Well done, film student.
A fashion model is trying to distance herself from an ex-husband who is the head of a sex cult (sample dialogue: "I don't want to sleep with other men, that's why I had to leave you"), so she and a friend move in to an apartment where the previous occupants have been recently murdered.
She must then avoid being killed whilst tangling with the predatory lesbian next door, the old lady down the hall who reads gory horror comics and a police detective who loves stamp collecting.