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Lina and Doon got there job assignments on "assignment day" in Ember school. Lina got pipeworks laborer and Doon got messenger, When Doon asked Lina if they could switch she agreed happily, Doon wanted to be close to the generator so that is why he traded with Lina.

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Lina's first was mysterious because she got a message from a guy named looper to the mayor about a "delivery at 8". This was important because later in the book they find out that the message is related about the food supplies they find in the storage vault.

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When Lina delivers a message to her friend Clary at the greenhouse, they see a guy coming back in from the Unknown Regions, who is very scared.

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Granny is still obsessed with finding whatever her grandfather lost, and Lina comes home one day to find Poppy chewing on a message from a mysterious box. Lina stopped Poppy from chewing on it. Lina tries to get people to help her decipher the message, but they're not into it

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Doon agrees to look at the message, and once they figure out that it's talking about something in the Pipeworks, they go exploring, and find a secret locked room. They can't get in, but someone else obviously can.

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Lina's grandma gets sick and dies. the girls move in with Mrs. Murdo, who has been very kind to them this whole time. Lina's grateful for the help.

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Lina tries to catch up with Lizzie, and finds taking a bunch of rare canned goods. It turns out that Looper stole them from the storeroom and is giving them to a few people that he likes.

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Lina puts together the puzzle pieces with Doon and realizes that Looper has been the one supplying the mayor with stolen food. They report this to one of the guards.

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Clary helps Lina figure out that the mysterious instructions are for how to exit Ember, so Lina and Doon go trying to explore the Pipeworks and figure out how to work the boats that were left there.

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Lina picks up Poppy from Mrs. Murdo, and meets up with Doon. They ride down the river and climb up to the earth's surface. Witnessing a sunrise for the first time blows Lina's mind