Her dream job would be messenger, so when she gets the job of working in the pipes underground, she is devastated. So when Doon asks to trade, (And he has messenger) she is excited. Soon she discovers a letter, that might just save the city- but it's destroyed and almost impossible to read- with the help of Doon she might just be able to figure it out.
Doon hated the whole idea of being a messenger, he wanted to be working with the lights, because he had a feeling he knew what was wrong. So he traded with Lina. When Lina finds a message that she thinks has something to do with getting out of the city he wants to help.
Poppy Mayfleet is the little sister of Lina. Poppy, finds the box that contains the message, but chews it up. Leaving it close to impossible to find out what it says.
Clary works in the Greenhouses, she is quiet and studious. Lina feels she can ask Clary anything and she will listen. Although she doesn't listen to much when Lina tells her about the mysterious box.
Mrs. Murdo is the neighbor of Lina and Poppy. Lina's grandmother isn't able to watch Poppy while Lina is at work, so she fills in, and is a great help. Soon Poppy and Lina must move in with her.
Lina and Poppy's grandmother is looking for something "missing" but has no idea what is missing. When she finds it she is overjoyed. But sadly soon she get's very sick.
The mayor of Ember isn't helping Ember at all, and, the people are really starting to hate him. Lina and Doon find out a secret about him that will change everything.