eee　　InPerugia,aserial-killerisstranglingcollegestudents.InspectorMartinoisinchargeoftheinvestigationandhasablackandredscarfastheonlyleadtobefollowed.HeasksthescarfstreetvendorGianniTomassoifherecallswhomighthaveboughtthescarf,butthemantellsthathecannotremember.ThenGianniblackmailsthekillerandbecomeshisnextvictim.Meanw... …