The loves of Ana Cecilia Luisa Deillez with the Mexican poet Amado Nervo.

During the so-called Conquest of the Desert, Major Sarabia is sent to the Cruz del Sur fort to replace Major Molina, who was murdered at the hands of the Indians. He is the only one who can stop Santiago, "the most rebellious of the caciques of the southern border, the only one who does not accept peace with the government."