This book is about a young girl and boy named, lina and doon. There city is underground.There is light bulbs that are hung from the top of there city. Lina and doon have assigned jobs from there high school. Lina works in the pipeworks and doon is a messenger. Doon asks lina to switch jobs and they did. Lina and doon find a document that has bin chewed up. They find out the message and it is the way out of ember! They follow the instructions and enter, the real world. The see a hole in the ground! The look down and there is the city f ember at the bottom. The write a message and drop it down the hole. And hopefully someone inds it.