Lights shine in the city of Ember—but at the city limits the light ends, and darkness takes over. Out there in the Unknown Regions, the darkness goes on forever in all directions. Ember—so its people believe—is the only light in the dark world.
And now the lights of the city are beginning to fail.
Is there a way to save the people of Ember? No one knows. But Lina Mayfleet has found a puzzling document, and Doon Harrow has made discoveries down in the Pipeworks. With these clues, they start their search.