October of 1968 at about 5PM students gathered at "La Plaza de las Tres Culturas" in Tlatelolco not far from downtown Mexico City to demonstrate against injustices from the Mexican government. My parents owned a condominium in Tlatelolco, Aguascalientes building where my family and I witnessed the most violent massacre in the history of that country. The movie portrays with a great deal of accuracy what took place in those buildings. Since the "granaderos" and members of of the Mexican armed forces had orders to kill students and teachers, I had distroyed my teachers' ID few weeks back when soldiers blew a hole through the main door of the Preparatory Number 1 school where I was teaching. Some scenes may be disturbing to some viewers because the movie depicts the reality of the massacre.