Synopsis
An American writer living in Rome witnesses an attempted murder that is connected to an ongoing killing spree in the city and conducts his own investigation, despite he and his girlfriend being targeted by the killer.
Cast

Tony Musante
Sam Dalmas

Suzy Kendall
Julia

Enrico Maria Salerno
Inspector Morosini

Eva Renzi
Monica Ranieri

Umberto Raho
Alberto Ranieri

Renato Romano
Professor Carlo Dover

Giuseppe Castellano
Monti

Mario Adorf
Berto Consalvi

Pino Patti
Faiena

Gildo Di Marco
Garullo

Rosita Torosh
Victim

Omar Bonaro
Police Detective

Fulvio Mingozzi
Police Detective

Werner Peters
Antique Dealer
Karen Valenti
Tina

Carla Mancini
Girl Watching TV
Bruno Erba
Police Detective
Annamaria Spogli
Sandra Roversi (uncredited)

Giovanni Di Benedetto
Professor Rinaldi (uncredited)

Reggie Nalder
Needles (uncredited)

Maria Tedeschi
Old Lady in Fog (uncredited)

Aldo Barozzi
Passerby who calls the Police (uncredited)
Ugo Mari
Mario Zandri (uncredited)

Romano Targa
Policeman (uncredited)
More like this

The Big Fake

Deep Red

The Fifth Cord

Mindcage

Opera

All the Colours of the Dark

The Case of the Bloody Iris

Watcher

The Night Evelyn Came Out of the Grave

The Prowler

All the Devils Are Here

Crooked House

Night of the Hunted

The Silence of the Lambs

Your Vice Is a Locked Room and Only I Have the Key

The Psychic

Abandoned

What Have You Done to Solange?

Maniac

Red Dragon