When a roamer trades them an ancient book with only a few pages remaining, Lina and Doon return to Ember to seek the machine the book seems to describe in hopes that it will get their new community, Sparks, through the winter.
- | Author: Jeanne DuPrau
- | Publisher: Yearling
- | Publication Date: March 23, 2010
- | Number of Pages: 304 pages
- | Language: English
- | Binding: Paperback
- | ISBN-10: 0375855726
- | ISBN-13: 9780375855726