This Film seems to be some kinda sequel to the Hunted City. Comissario Ferro comes from Rome to Milan. The violence is at a all time high. Gangsters dress up with some bizarre Carnival-masks. They use this outfit to liquidate some opponents. Ferro is no friend of such behavior and so he uses his gun the traditional way and lightens their masses a little bit.
Even though the ending is a bit disappointing, the film contains a great fight in a plastic-factory with lots a white plastic bottles. Visually nice! I like the documentary-style of Massis Camera very much. It makes the film so involving and real. His Experience in the Western-Genre as Camera operator in films like "C'e Sartana vendi la pistola..." and "Dio Perdoni la mia Pistola" sure comes in handy. Joan Collins had no trouble with face-surgery at that time.