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At Lina's and Doon's school, Assignment Day was going to come on the next day. This meant Lina, Doon, and their other classmates were to be assigned a specific job to help Ember thrive. Lina really wanted to be a messenger, but she got Pipeworks Worker. But, her classmate Doon got Messenger. Doon wanted to be a Pipeworks Worker to fix Ember's generator, the job Lina had, so they traded jobs.

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Lina sees a strange man walk out of the unknown regions when giving messages. This man was none other than, Sadge Merrall. Sadge told everyone the unknown regions has nothing but monsters and darkness. Lina agrees that the there has to be something outside these Unknown Regions, not just complete darkness like they learned.

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Doon goes for his first day in the pipeworks with an experienced worker named Arlin. Doon learns that the generator is powered by the river by hydroelectricity. But, it seems the generator shuts down every couple minutes now. So, Doon feels like he could fix the generator. The generator is actually way more complex and more modern than Doon actually thought.

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Lina comes back from work to find Poppy chewing on bits of paper next to a box. Lina says that the handwriting looked so nice, that it was like printing on a food can. She tries to put the message back together, but some of the letters are missing. Lina decided to show her friends this message, but nobody took it seriously, except Doon.

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Doon finds a locked door in Tunnel 351, making him curious to see what was inside the door. Doon found a key inside the lock, just there without any protection. He opened it only a few inches, and found many thing citizens didn't have access to. Some items included: crates, packages, mounds of cans, heaps of clothes, rows of jars and bottles, and even light-bulbs. He made a shocking discory after seeing those. The mayor was sitting in the armchair, eating good food the citizens didn't have, watching TV. The mayor was hoarding all of this to himself.

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Lina and Doon go to Clary, Lina's friend in the greenhouse, to help them decipher this message. Clary finds a word in the title that can be deciphered to get the word "egress." Lina deciphered the word Ember in the title, following suit. Not long after, Clary told that egress meant exit. The conclusion was shocking, "Instructions to Leave Ember."

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Lina and Doon have been spreading the word that there is a way out of Ember and they can show the people. This actually makes Lina and Doon criminals for spreading apparent rumors. This meant Lina and Doon had to leave for the river on their own. She sneaked back to her home and took Poppy to bring along. After that, they wrote detailed instructions on how to leave Ember. But, it was found that Lina forgot to leave the message for the citizens when leaving.

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Lina, Doon, and Poppy go on the river, leaving the pipeworks behind. They went through a tunnel where Doon started to make light with matches to make a movable light. They found a rock slope, which Doon thought was the end of the  journey. Doon's thoughts were partially correct, giving a pathway to a sign.

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The sign seen in the room was one that was made by the Builders, saying that they wish good fortune on the path to escape Ember. They started going up a ladder that would lead them to the light above.

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Light was shown through a hole from another city. Once they went up, they saw natural light for the first time. The warmth was new, as Ember didn't have all of this at all. Lina and Doon saw birds for the first time too. They kept seeing things that were not available in Ember.

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Lina and Doon find a journal from a mysterious woman talking about how Ember did not have the things that were up there, and revealing Ember was under the ground. They see the sun, calling it a fiery circle. But, something caught their attention, a road. This meant people actually did live here, and they were thriving. Lina and Doon tasted fruit on trees out in the outside world. They discovered things that were new to them along the way. Something hit Lina and Doon at that moment. If Ember was underground, they could drop the message to the ground, and just hope someone like Clary would find it. Right when they threw it, Mrs. Murdo was right there, standing next to it.