Personally I find this film the best one among the whole saga of the Tomas Milian/ Er Monnezza saga . Tomas Milian plays the double role of the police commissary Nico Giraldi, formerly a thief who decided to join the "good ones" enlisting in the police, without loosing his attitude of rude man of the periphery , with a terrific language in pure roman dialect, and the Chinese Chin Chun Chao. All the series is a real cult in Italy,particularly in Rome, where - if you may have noticed - the posters of those films can be purchased as souvenirs of Rome in Piazza Navona or close to the Fontana di Trevi.. A lot of people know - even now, , 25 years later - perfectly a lot of dialogues, even young people, which were unborn by the time the movie was turned. Beside Milian, a great Bombolo ,this time with Enzo Cannavale, the Neapolitan actor who used to be his partner in some theater pieces of the time ( by the way, Bombolo used to sell umbrellas on a Ape Piaggio, when he was " discovered" and became a cinema star , of course of trash cinema). If you understand at least a bit of Italian,this film is an experience you should try : it will also help you a lot learning the language, of course the swore words!