A modern-day Jack the Ripper stalks Rome, and American tourist Sam Dalmas (Tony Musante) bore helpless witness to one of his attacks. His passport revoked until the killer is caught, Sam and his girlfriend (Suzy Kendall) decide to pursue their own investigation into the murder spree... and put themselves in deadly danger. Suspenseful and assured directorial debut for Dario Argento also stars Eva Renzi, Enrico Maria Salerno; music by Ennio Morricone. AKA: "The Phantom of Terror."