Cecilia is a sociology professor at the university. After a class, two of her students are kidnapped by agents of the CNI, the political police of Augusto Pinochet's regime. The experience changes her, and she decides to join the armed resistance with the Manuel Rodríguez Patriotic Front. It is there where she meets her commander and companion in the fight: Rodrigo.

Cecilia is part of a cell of the Manuel Rodríguez Patriotic Front that operates in the port of Valparaíso. The group carries out an action that lands them on the news. Cecilia adopts her combat alias; she will be known as "Tamara." Bareta, the agent of the CNI, investigates the attack carried out by Cecilia's group and discovers a clue that leads him to them.

Cecilia cannot see her family; she is living in hiding, fleeing from the CNI. Her group, led by Rodrigo, organizes an operation to rescue Salomón. Cecilia and Rodrigo travel together to Buenos Aires, which intensifies their relationship. Cecilia stands out for her work in the operation, and Rodrigo asks her to participate in the main mission of the Patriotic Front.

The country is agitated; people protest against the dictatorship, but the military responds harshly. Cecilia travels to northern Chile with a new mission and demonstrates her leadership, for which she earns a reward within the Patriotic Front.

Cecilia has settled into a house in the mountains to plan the attack. The Front's mission is jeopardized by Bareta's actions, and they must change strategy. Rodrigo and Ignacio recruit their most loyal soldiers to carry out an attack against the tyrant.