omardelvalle_2000 This classic Mexican Movie show us, the classic lifestyle of the Mexican construction workers in the middle 70's. This story begins with the police investigation of the murder of the night watcher worker ( Ignacio Lopez Tarso). During the police investigation. It's possible to see, the corruption, the robberies, the act's of infidelity, the envy and the badly treatment that the workers received from the overseers. You can see a lot of great Mexican actors working in this movie. Sometimes you can hear a lot of bad language, but the real goal is to portray the real situation that this people were living in that time. The police never catch the real assassin, the viewer must use it's criterion and imagination to recognize the real guilty, for that reason it contains certain mystery. I recommend this picture to watch and analyze it.