Nabucco’s daughter Fenena is the hostage of the Jewish people. Zaccaria the High Priest of the Jews places her in the care of Ismaele, and they fall in love. They attempt to elope, but Fenena’s older sister Abigaille threatens to denounce them unless Ismaele becomes her lover. The rivalry between the sisters aggravates Abigaille’s thirst for power and genocidal tendencies. She defies her father and persecutes the Jews. But Nabucco regains his senses and kingly power when he turns to the God of the Jews…