Isabel gives birth to Prince Juan. The kings see their objectives fulfilled: the definitive victory over Portugal and a male heir to the crowns of Castile and Aragon. However, Isabel does not give up until she manages to lock her enemy Juana in a convent. But the consequences of being a mother and queen are manifested in all its harshness in the high price you will have to pay to sign the peace.

Isabel and Fernando differ on the convenience of agreeing with France and implanting the Inquisition, two matters of great importance for the future of the kingdom. Both try to achieve their goals behind the other. When Fernando knows he will feel betrayed. Beatriz de Osorio takes advantage of conjugal disagreements

Isabel still feels humiliated by Fernando's adventure with Beatriz de Osorio. Resentment and the fear that such an offense will repeat itself will weigh down his commitments as ruler. The council of fray Hernando de Talavera will facilitate the necessary reunion of the monarchs, but they will have to be Isabel and Fernando who solve their disagreements.

Meanwhile, Aixa continues to conspire to make his son Boabdil an emir. But this does not seem possible as long as Muley Hacén and his son Nasr are alive. Aixa will decide to give the final blow in a delicate moment, because the Nasrids plan to attack Zahara and take the Christian village by surprise.