The Cat o' Nine Tails

Typically over-the-top murder mystery from Argento, neglecting its rather straightforward plot about a series of killings connected with a genetics research institute in favour of gruesome set pieces, bravura camera-work and set design (one character has some truly amazing wallpaper, seemingly spattered with blood), heavy symbolism, and a strong sound-track by Ennio Morricone. Reason doesn't come into it; gorgeous, grisly style is all.