Mockingjay and Catching Fire.

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Mockingjay and Catching Fire are the sequels to The Hunger Games.  Catching Fire the first sequel tells of how Katniss's life is affected when she gets home.  Also, she is forced to marry Peeta.  Before any of the arrangements are started, Katniss finds out that herself and Peeta have to go back into the Hunger Games.  When she does get there, she makes several allies.  While competing in the Hunger Games, a genius plot that had earlier been developed frees them from the dome shaped arena. This is where Mockingjay begins.  District 13 doe exist as Katniss shortly finds out.  She is shown as the symbol of the rebellion that is happening.  During the war, Peeta is taken captive and when he comes back, he had been hijacked so that he hates Katniss.  They eventually become friends again though and after the war is won by the rebels, they marry and start a family.  However, during the war Prim dies.  These two books are very good additions to the Hunger Games Trilogy!