"The Books of Ember" is a series of young adult novels written by Jeanne DuPrau. The story is set in a post-apocalyptic underground city called Ember, where the inhabitants rely on a failing electrical system and dwindling supplies. The main characters, Lina Mayfleet and Doon Harrow, embark on a quest to uncover the secrets of their city's origins and find a way to save their community from impending darkness. The series consists of four books: "The City of Ember," "The People of Sparks," "The Prophet of Yonwood," and "The Diamond of Darkhold." Each book explores themes of hope, survival, and the importance of knowledge. As Lina and Doon navigate challenges, they learn about the value of cooperation and the power of discovery in their quest for a brighter future.