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An American writer (Tony Musante) traveling in Rome is the only witness to an attempted murder by a sinister man in a raincoat and black leather gloves, though he is powerless to do anything to stop him. With a feeling that something is not quite right about the scene he has witnessed and the police's inability to make any progress, he launches his own personal investigation -- and nearly loses his life in the process. While this modern day Jack-the-Ripper type is slithering through the dark byways of Rome slicing up pretty girls, director Dario Argento is carving up the emotions of terrified viewers. (forgalmazó hivatalos szövege)