The film portraits the stage previous to the outbreak of the Mexican Revolution, from the end of Porfirio Díaz´ government, the social volatility, the ephemeral government of Madero and the presence of the working class in the figures of Villa and Zapata, until the signing if the Constitution of 1917. All of this through moving images, filmed during those events mainly by the Alva brothers, filmmakers of that time. Those images let us perceive the contradictory and shuddered glance of the people of that period.