Mockingjay by Suzanne Collins
The book begins after the Hunger Games which takes place in the second book in the series (Catching Fire). Katniss Everdeen, the book’s main character, is in district thirteen (led by President Coin) which is now the base that is underground for the rebellion against the Capital and President Snow. Katniss and the others including her sister Prim, her mom, and Gale, Katniss’ hunting partner, and friend take classes and try to better themselves for the rebellion. However, Peeta Mellark, who was the co-Hunger Games winner with Katniss was captured after the games by the capital.