A black gloved killer, semi-naked women slashed by a razor, police baffled. Twists and turns and roundabouts. We're deep in giallo territory here. It's a serviceable little film with all the hallmarks - bright red blood, closeups of eyes, men with bad wigs and aviators - but it also makes you realise the genius of Argento and Bava and even the bravura of Fulci.