"The People of Sparks" is a novel by Jeanne DuPrau that serves as the sequel to "The City of Ember." The story follows the survivors of Ember as they emerge from their underground city and discover a new community called Sparks. The residents of Sparks are initially wary of the newcomers, leading to tensions and misunderstandings. As the two groups interact, they face challenges such as resource shortages and differing values. The novel explores themes of cooperation, conflict resolution, and the importance of community, ultimately highlighting how people can work together to overcome obstacles and build a better future.