Lina Mayfleet and Doon Harrow are the Protagonists in this story. Lina is described as having long, dark hair, and hazy blue/green eyes. She is of medium height and loves to run. She wears a red jacket since she is the city's messenger. Doon Harrow is average sized and has thick, dark hair. He was assigned to work in the pipeworks of the city.
Lina and Doon wanted to save the city and bring light to their world. By using their jobs and remarkable intelligence, they found an abundant amount of supplies and a possible way out of Ember through the pipeworks. However, when they were searching they found the mayor indulging and wasting the city's resources, feeding his gluttony.
Lina and Doon were planning on telling the city about their corrupted mayor and the way to happiness in the light, but the mayor found out and was greedy. He ordered his guards to find and arrest Lina and Doon for "spreading vicious rumors".
So, Lina and Doon ran, taking Lina's younger sister Poppy with her, but they didn't have time to liberate the city or tell anyone of their discovery. Eventually, they found the way to a world with light coming from the sky, and plants and animals everywhere. They then finally discovered the reason why Ember was so dark.