An Unknown Enemy

The regent of Mexico City, Corona del Rosal, wants to weaken his main adversary in the presidential succession by getting rid of the National Security Directorate. Meanwhile, Major Barrientos, the DNS leader, tries to strengthen its position.

The students' voice becomes louder despite their lack of organization. But after the death of one of the student leaders and with the assistance of Barrientos, the students will finally become a more cohesive force.

Barrientos infiltrates guns among the students to make them seem like a more threatening force to President Diaz Ordaz. Meanwhile, the CIA tries to influence the military leaders of the country to move forward with a coup and they reject their plans.

The Army, at the behest of the president, takes over the UNAM; Dean Barros Sierra resigns his post, causing greater political pressure on the president to start dialogue with the students; Barrientos plots a different plan of violence.

The negotiations between the students and the government are moving forward. Corona del Rosal still plans to arrest the leaders of the National Strike Council during a planned march, and Barrientos has placed snipers around the plaza.

Fernando Barrientos has plenty on his plate as the new vice secretary; Luis Echeverría makes a dirty political move amid the students' unrest.