4 mosche di velluto grigio (1971)

A newspaper reporter and a retired, blind journalist try to solve a series of killings connected to a pharmaceutical company's experimental, top-secret research projects and in so doing, both become targets of the killer.

A witness of an attack, a writer becomes stalked by a serial killer.

A young opperata is stalked by a deranged fan bent on killing the people associated with her to claim her for himself.

An American writer in Rome is stalked by a serial killer bent on harassing him while killing all people associated with his work on his latest book.

A young man tries to help a teenage European girl whom escaped from a clinic hospital after witnessing the murder of her parents by a serial killer and they try to find the killer before the killer finds them.

An American college student in Rome and his sister in New York investigate a series of killings in both locations where their resident addresses are the domain of two covens of witches.

After witnessing the murder of a famous psychic, a musician teams up with a feisty reporter to find the killer while evading attempts on their lives by the unseen assailant bent on keeping a dark secret buried.

An elderly and retired police detective and a young amateur sleuth team up to find a serial killer whom has resumed a killing spree in Turin, Italy after a 17-year hiatus.

A young policewoman slowly goes insane while tracking down an elusive serial rapist/killer through Italy when she herself becomes a victim of the brutal man's obsession.

A young girl, with an amazing ability to communicate with insects, is transferred to an exclusive Swiss boarding school, where her unusual capability might help solve a string of murders.

A Rome policewoman teams up with a British Interpol agent to find a crafty serial killer whom plays a taunting game of cat-and-mouse with the police by abducting and killing young women and showing it over an Internet web cam.

In the chaos of the final days of the Italian revolution a thief and a baker hook up and travel the streets of Milan witnessing the historic events, which quickly take a dark turn.