On the day of Pinochet´s coup d'état, one of the last people to see Salvador Allende alive is his advisor and friend, Manuel Ruiz, a young Spanish political scientist. The president asks him to save his own life and tell the world what happened in Chile. And that's exactly what he does in the series.

Manuel recounts how political tensions escalated after the victory of the Popular Unity and the sabotage that included a truckers' strike financed by the USA, which worsened the country's economic situation. In an attempt to overcome the crisis and strengthen his legitimacy, Allende decides to hold a referendum, but the process is interrupted by the coup.