City of Ember

City of Ember is a great movie. Its about these 2 kids named Doon and Lina. they lived in an underground city called ember. there is this metal box and its the instructions of how to get out of the city that is collapsing and running out of food. But the box is hidden somewhere and they must find it to survive because the lights are going out. Will they find the way out? And if they do how would they tell everybody?