The City of Ember

The city of Ember was built as a last refuge for the human race. Two hundred years later, the great lamps that light the city are beginning to flicker. When Lina finds part of an ancient message, she’s sure it holds a secret that will save the city. She and her friend Doon must race to figure out the clues before the lights go out on Ember forever!
 

• The People of Sparks (City Of Ember Book 2)
• The Prophet of Yonwood (Book of Ember 3)
• The Diamond of Darkhold (Book of Ember 4)
• The City of Ember: The Graphic Novel
• Moo: A Novel
• Diamond Willow
• The Underland Chronicles #5: Gregor and the Code of Claw
• The Underland Chronicles #3: Gregor and the Curse of the Warmbloods
• The Underland Chronicles #4: Gregor and the Marks of Secret
• The Fourteenth Goldfish