City of Ember, written by Jeanne DuPrau, follows the story of two friends in their underground electronic society. The twelve year-old characters are forced to escape without being caught by their corrupt mayor. By following instructions that were written over 200 years ago will they even be able to escape? I really liked this book and it was written wonderfully. The storyline folds and flips as you read through the novel. I would recommend this book to an age group of 10-14 because it is a thicker book and deals with adult content.