The Bird With The Crystal Plumage (1970) follows a man who witnessed a crime and was dedicated to find the serial killer before leaving Italy.
Two Evil Eyes (1990) is a Romero/Argento anthology consisting of two tales: The Facts in the Case of Mr. Valdemar and The Black Cat.
Torso (1973) is about a mysterious killer who wears a hooded mask who terrorizes college art students in Italy with a knife.
The Washing Machine (1993) is about an alleged murder and remains that were discovered in a washing machine in this twisted crime story.
Killer Nun (1979) is about a nun who has an uncontrollable urge to torture and kill other patients and nuns within the convent.