The City of Ember
Jeanne DuPrau
 Unidentified architects, referred to as "The Builders", designed an underground city with supplies for its inhabitants to survive for 200 years. During that time, the Earth would be dangerous (because of a war) and later uninhabitable for an unspecified reason, although the book's prequel, The Prophet Of Yonwood'', points at that reason being a devastating nuclear war. After completion of the city, the Builders give the first mayor of the city a locked box that was to be passed down from one mayor to the next. Unknown to the mayors who were to pass it down the line, the box was set to open after 200 years and provide instructions to the city's inhabitants on how to return to the surface. For several generations, the box is faithfully passed down from one mayor to the next until the seventh mayor who, hoping that the box might contain a cure for the deadly cough that was infecting many citizens of the city at the time, takes the box home and tries to break it open. He fails, and dies before he is able to return the box to its rightful place, or inform anyone else of its importance. The story moves forward to the year 245 where the town is running out of supplies and the massive generator that provides the light and power for the city is on its last legs. At a graduation ceremony where young people are assigned their jobs, Lina Mayfleet is unfortunately assigned the job of “Pipeworks Laborer", while Doon Harrow has to be a “Messenger.” Both are unhappy with their assignments, and decide to switch jobs. At home, Lina's grandmother finds an old piece of paper she salvaged from inside a box. Unknown to her, it is the box that was passed from mayor to mayor. Currently, many people referred to as the "believers" believe that the Builders would come back and guide the citizens of Ember out of the city. Lina attempts to decipher the letter, but her little sister, Poppy, has chewed on it and the letter has holes and is ripped. Finally, she asks Doon and other people to help her reconstruct the letter. After much trial and error they realize it's instructions from the builders on how to exit the city, trying to find the exit. Soon, they find an underground river, where they discover boats meant to be used by the community. They go on a wild boat ride and when the boat finally stops, they find an old journal explaining the history of Ember. The Builders decided to protect 100 adults and 100 children to ensure that the human race would survive. After they find the journal they are faced with a very steep climb that takes hours, but when they get to the top they discover the outside world, and through a series of events they find a cave leading to a cliff that shows the city miles below. In a scene reminiscent of Plato's Allegory of the Cave, they are shocked when they see the dim, glimmering lights of the city beneath them; they never knew they were living underground. They throw a rock with instructions tied to it down to the city in hope that the people of Ember will escape. The novel ends with Mrs. Murdo, Lina's guardian (or Loris Harrow in the movie) finding the note.