During a conversation between a grandfather and his grandson, the latter tells him the story of the liberator General José de San Martín (1778-1850) from the patriot's childhood, through his stay in Spain, his return to the Río de la Plata, the development of the continental plan and the European exile.
A young actress intends to win over a man who, after Don Juan's fame, had isolated himself in a ranch, for which she disguises herself as a man and becomes his chauffeur.
