The city of Ember was built as a last refuge for the human race. But now with terrifying blackouts sweeping through the streets, Lina and Doon know it's only a matter of time before the lights go out and never come back on again. When Lina finds part of an ancient message, she's sure it holds a secret that will save Ember. Together, she and Doon explore long-forgotten parts of their dying city as they race to solve the mystery. If they succeed, they will have to convince everyone to follow them into danger and an exciting new world. But if they fail? The lights will burn out and the darkness will close in forever.