After the death of her brother Alfonso, Isabel is deeply distressed and morally sunk. Her life has turned into a succession of losses. In his environment, Carrillo is clear that the war must continue and that Isabel must succeed as queen on the side previously headed by Alfonso. Chacón, is not it so much? And Pacheco continues playing between two waters.

Even so, Isabel assumes at first the relief and signature as queen in the letters that notify towns and cities of the death of her brother.But Isabel needs to see her mother, to inform her of what happened in person. And it goes to Arévalo along with Gonzalo Fernández de Córdoba. There, sad to see his mother worsen by the news, longing for other times, find refuge in the friendship of Gonzalo.

Isabel, frightened and sunk by the threats received, does not decide who to marry: the Duke of Guyena or Fernando de Aragón. Both are of the same age. And the Frenchman guarantees that he will avoid further tensions with his brother the king, who holds him responsible, should he refuse, for a new war.

That is why he asks Cárdenas to travel to Zaragoza and Paris, get to know both suitors thoroughly and inform him with hairs and signs of how they are. And then, will she decide?

Cárdenas fulfills the order of Isabel¿ but, as Chacón y Carrillo, his bet is clear: Fernando de Aragón. The bet of Juan II, king of Aragon, is also clear: Aragon, at war with France, needs support. Your financial situation is complicated? And this wedding can be a good option for the future, by uniting the interests of your kingdom with those of Castilla.