What a bizarre mess!
We begin by seeing a woman having her car break down and getting a pair of scissors in her neck for her trouble, which then leads to a shot of a deranged man tending a lettuce patch and chuckling. We then cut to another young lady who breaks down and calls her boyfriend to get help. He's says he'll be right along, but neglects to mention he's in bed with another girl. Naughty, fella, naughty!
This guy is Marcello and every single female member of the cast wants to tug his tummy banana. Marcello does eventually head off to pick up his girlfriend, but not before she receives a pair of scissors to the neck (although she's given time to strip off for the camera of course). Marcello is confused when he discovers his girlfriend's car is still around, so he's unsure where she's disappeared to, and instead he ends up at a villa full of very emotional people/suspects.
There's the afroed-wheelchair scientist who has perfected a machine that can print out peoples thoughts (which it does by taking pictures via the eye of a gold statue situated in the dining room!). His wife, who suffers from 'Erotomania', whatever that is - she just seems pissed off that she lives in the country, and their neice, a blonde, sexually repressed girl who lives in terror of her uncle and seems to be the main subject of the thought machine. Plus, there's the doctor who looks after the scientist, the giant gardners guy, angry butler Alberto and yet another sexually repressed maid who has the hots for Marcello, and everyone else for that matter.
This film looks like it cost about five lire to make and even though there's plenty of nudity to keep you awake, an interminable dinner party in the middle almost derails the whole thing. Luckily the thought machine and a novel death for the killer goes in its favour. Of course the killer's motives don't make much sense and there's a couple of extra twists at the end because...you know...it's a giallo. Got to have twists!