Before the action begins, the villainous Ormondo was in love with Isabella, who was happily married to Duke Bertrando, but, when she rejected his advances, Ormondo spread vicious rumours about her reputation and bribed Batone into casting her adrift in a boat on the sea. However, she was rescued by a local miner, Tarabotto, who then disguised her as his niece, Nisa.
Time: The distant past Place: A seaside mining village in Italy The opera begins ten years after her rescue. Duke Bertrando is due to visit the mines. Isabella, who is still in love with her husband, finally reveals her true identity to Tarabotto who promises to help her. The duke arrives with Ormondo and Batone. The duke is still in love with his wife even though he believes the rumours that she had been unfaithful to him. Batone catches sight of "Nisa" and realises she is Isabella in disguise. He plots with Ormondo to abduct her that night, but Tarabotto overhears their plan. Before they can kidnap Isabella, the two villains are unmasked and "Nisa"'s true story is revealed when she shows everyone her duchess' clothes and a portrait of the duke she has kept with her. Bertrando and Isabella are reunited.
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