The Third Eye

The Third Eye is a 1966 Italian horror film. It was directed by Mino Guerrini and stars Franco Nero, Gioia Pascal, and Erika Blanc. A young count, who lives with his domineering, jealous mother, begins on a downward spiral into madness after his fiancée dies in a car accident. This was one of Franco Nero's earliest films, before he achieved stardom in the spaghetti western genre. Erika Blanc plays a dual role in the film, portraying both the Count's dead fiancée Laura, as well as Laura's twin sister Daniela.

Synopsis from Wikipedia, CC BY-SA 4.0. Everything below written here.

Poster © the film's rights holders.