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.

The Vault -- 1. The Storm -- 2. The Roamer -- 3. The Book of Eight Pages -- 4. Plans for a Journey -- 5. Across the Hills -- 6. A Light in the City -- 7. Calamity -- 8. Prisoner -- 9. Perfectly Safe and Comfortable -- 10. Looting -- 11. The Shepherd -- 12. Feast Night -- 13. The Diamond -- 14. Something Strange -- 15. A Plan -- 16. A Night with Maggs -- 17. The Secret of the Key -- 18. In the Pipeworks -- 19. Across the Empty Lands -- 20. The Battle at the Rock -- 21. Stranded -- 22. Return and Discovery -- 23. Home Alive -- 24. The Salvage Expedition -- 25. Light for the Journey -- 26. An Interesting Arrival -- 27. A Bright Future.