Giallos are the answer!

I'd start with Argento's Deep Red then the genre essentials:

Tenebrae

Opera

Don't Torture a Duckling

Murder Rock

Night School

The Psychic

The Bird with the Crystal Plumage

Blood and Black Lace

A Bay of Blood

Four Flies on Grey Velvet

What Have You Done to Solange?

Eyeball

Torso

The Girl Who Knew Too Much

I'd also suggest DePalma's Dressed to Kill, Blow-Out, and Body Double.