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.
Madrid, Spain, early 20th century. A woman turns up dead in a modest home. She turns out to be María la Jerezana, a popular singer who was famous years ago until she disappeared. The Police Commissioner in charge, dissatisfied with the official version, which concludes that the crime was the result of a simple robbery, is determined to find out the truth.
