Yes, the overall setting for Mockingjay is Panem, a post-apocalyptic North America. In the novel, much of the action revolves around the Capitol, District 2, 8, 12, and 13.
As the novel begins, Katniss, Prim, and their friends are refugees adjusting to life in District 13. Although Katniss is grateful for District 13's hospitality, she is resentful that it had a part to play in District 12's destruction. The early chapters of the novel have Katniss visiting District 12 to survey the ashes of her home base and then returning to her new life in District 13. District 13 is built almost entirely underground, and life is extremely regimented there. Katniss finds herself fascinated with what she considers the only thing of beauty in District 13: a glass-enclosed environment that replicates a meadow, filled "with real trees and flowering plants, and alive with hummingbirds."
Meanwhile, as the Mockingjay, she continues to plot the logistics of future rebel actions from District 13. Katniss and her...
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