The Staatstheater Mainz writes:
Nabucco, king of the Babylonians, raids the Hebrews and destroys their temples. His daughter Fenena defects to the enemy camp. Her love for the slave Ismaele is a thorn in the side of her half-sister Abigaille. She is not only fighting against Fenena, but against the subjugated Jewish people.
But then Abigaille finds a document that reveals that she is the daughter of a slave and will therefore never be entitled to the crown. Only an intrigue and the mental decline of her power-obsessed father ...