The young Candelas, seduced and abandoned by Arturo, an unscrupulous womanizer, meets two soldiers, Tiburcio and Angelillo, who, in order to help the girl out of her predicament, organize a musical recital to raise money.
In 1336, Pedro, heir to the Portuguese crown, marries Constanza Manuel de Villena, a Castilian noblewoman, for political reasons; but the impulsive prince ends up giving in to his love for Inés de Castro, his wife's lady-in-waiting.
Carlos goes to visit his girlfriend Juana at the asylum where she works. Once there, the director introduces him to his niece, who is obsessed with playing the harp, and to a nurse who repeats word for word what Carlos says.
