At the end of the seventeenth century, in Naples, still dominated by the Spaniards, a young pupil, Balthasar,is castrated to preserve the purity and beauty of his voice. The Duchess dies and her son, the Duke of Arcos, takes charge of the inheritance, which includes Balthasar. With the entrance of Maria Loffredo, former lover of the Duke, a triangle is established that unchains tragic consequences to the allegedly callous life of Balthasar.