In Perugia, a serial-killer is strangling college students. Inspector Martino is in charge of the investigation and has a black and red scarf as the only lead to be followed. He asks the scarf street vendor Gianni Tomasso if he recalls who might have bought the scarf, but the man tells that he cannot remember. Then Gianni blackmails the killer and becomes his next victim. Meanw... (展開全部)