It is based on the true story of the Quispe sisters and on Juan Radrigán's play "Las Brutas".

[2] The film depicts the tragic story of Justa, Lucía, and Luciana Quispe, three sisters who worked as goat-herders in the Chilean altiplano located in the Atacama desert region, the ancestral home of the indigenous Colla people.

In 1974, the sisters were worried that their animals were losing their economic value due to the growing rumors about the military government that had reached even the remotest areas of the country.

Already affected by the loss of one of their sisters, they were further frightened by the news that the military had reached the nearby town of Copiapó.

Digna's personality was believed to reflect her life in the Altiplano, and it left an indelible mark on the film.