Doon Harrow is a serious boy described to have a serious face, rumpled hair, and dark, thick eyebrows. He is intelligent and observant, quick to anger, and passionate in his determination to find a solution for Ember's issues. He has a father who takes care of him in a house. He is a main character, along with Lina (best friend). He helped people find out a way out of this horrible city, to see the light of Earth above us.
His job is to work in the Pipeworks. He got this job by trading with Lina Mayfleet, who had originally gotten the job of working in the Pipeworks with Doon getting Messenger, what Lina wanted. They traded jobs and went along with those jobs.