Lina and Doon live in a city that is quickly running down. The lights of the city are flickering on and off, and as soon as they generator fails, they both realize that the people in the city will die. While looking for an answer to this problem, Lina finds an ancient message and asked for Doon's help to decipher it. Together they learn what the builders wanted to show the city--the way out.
The City of Ember is a great juvenile fiction book that I enjoyed. It has mystery, action, and character.