The City of Ember was built as a last refuge for the human race. Two hundred years later, the great lamps that light the city are beginning to dim. Lina and her friend Doon must race to figure out the clues to keep the lights on.

If they succeed, they will have to convince everyone to follow them into danger. But if they fail, the lights will burn out and the darkness will close in forever. They discover fragments of an ancient parchment and begin to wonder if there could be a way out of Ember. Can they decipher the words from long ago and find a new future for everyone? Will the people of Ember listen to them?