It takes place in 1827, in Carmen de Patagones, in the context of the confrontation between the militias of the United Provinces of the Río de la Plata and the navy troops of the Empire of Brazil. It is the story of a fort lieutenant who falls in love with a young woman.

Three orphaned brothers and an elderly inventor, who live in the countryside, become acquainted with a young governess and her uncle, who live in a large estate nearby.