If you loved Deep Red, try The Bird with the Crystal Plumage
A bridge between a film you've already seen and one most people haven't. Here's what they share, and what the second one does that the first one doesn't.
What they share
Both films are directed by Dario Argento, and they both carry the dread, surreal mood tags, and they sit in Horror / Mystery / Thriller territory. If that's the register that drew you to Deep Red, the second film will land in a comparable space — through a different lens.
dreadsurreal
What The Bird with the Crystal Plumage is
Rome. Wet streets, late at night. The shriek of a woman. Sam Dalmas, an expatriate novelist, sees a shadowy figure attacking a woman in an art gallery, but he's trapped between glass doors. The killer, masked, begins hunting him. Argento's debut refines giallo conventions.

