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On Assignment Day, Lina Mayfleet and her classmates, including Doon Harrow who picks out Messenger. Lina got the work of Pipeworks Laborer. They both did not like their assignment, so they decided to trade.

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Granny is searching for something, although she cannot recall herself what she is looking for. The only thing that she can recall is that it is something very important, something that her grandfather, the seventh mayor of Ember left.

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Granny finds what she was looking for, a box in the closet. However, Poppy got to it before Lina did! She chewed and tore the paper and now, Lina does not know what was on the paper. She will have to decipher the message in order to read it.

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Lina tells Doon about the mysterious message full of holes. They start to think about what the message is trying to tell them, deciphering the instructions.

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Granny unfortunately dies from the same sickness that Lina and Poppy's parents died from. However, Mrs. Murdo kindly takes them in, giving then a home and food.

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Lina finds out that Lizzie and her boyfriend, Looper had been getting things secretly from the mayor and the storerooms. In her sack, there were amazing foods, some that Lina has never ate. Lizzie tells Lina that if she keeps it a secret, she will get some of the foods. However, Lina declines the offer.

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Clary helps Lina get closer to understanding what the paper is trying to tell them. Doon continues exploring the pipeworks to find what they are looking for, which is a rock marked with an "E".

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Doon and Lina finally finds the rock marked with an "E", and goes downward to a place where they see a door. In the room, they discover strange new things such as matches and candles, which are movable lights, and boats.

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As Lina and Doon plan to announce the discovery at the singing, they become two wanted kids. The mayor says that they are spreading vicious rumors about him. The two has no choice but to leave a letter and go by themselves.

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Lina and Doon escapes Ember with Poppy. They find out that Ember was a city underground. Also, they discover new things like light in the sky, (moon and sun) and birds, as well as grass.