Lina Mayfleet is a fictional character from the novel "The City of Ember," written by Jeanne DuPrau. She is a determined and resourceful young girl who works as a messenger in the underground city of Ember. Lina is curious about the world beyond her city’s dark walls and dreams of a brighter future. As the story unfolds, Lina discovers clues about the city's failing power supply and embarks on a quest to find a way to save Ember. Her bravery and optimism drive her to seek answers, making her a central figure in the fight for her community's survival.