The City of Ember, written by Jeanne DuPrau, is a captivating science fiction novel set in an underground city. The story follows Lina and Doon, two young friends who uncover a secret message that leads them on a quest to save their dying city. The City of Ember explores themes of discovery, friendship, and the importance of knowledge. This gripping space novel keeps readers hooked with its suspenseful plot and intriguing world-building.