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Mockingjay, the third and final installment of the kickass Hunger Games series (if you haven't read any of them OMG what have you been DOING with your life?) begins with Katniss in the once thought to no longer exist District 13. District 13 lives a fairly Spartan lifestyle, in both the frugal and the military sense. District 13 is heading the rebellion against the Capital, which by now almost all the districts have joined in. Katniss has not. She drifts around, unfocused, unwilling to help, worrying about what the Capital is doing to Peeta. The leaders of District 13 want her to become the mascot of the rebellion, the Mockingjay. Katniss finally agrees when she realizes that she can agree to be their mascot in exchange for things that she wants, such as Peeta's pardon if the rebellion wins.
A major issue to this plan is that Katniss sucks at being a mascot, so she's sent out into the actual war, with her camera crew following her in the hopes of getting good footage. Katniss as the Mockingjay does inspire people, and the tide turns against the capital. The rebellion is even able to take over the Capital's airwaves and begins broadcasting promos with Katniss on TV. Then Katniss sees Peeta on TV, and he's broken and beaten and sickly, and something else seems strange as well. Katniss completely falls apart, and a rescue mission is sent in. Peeta is saved, along with some of the other victors from the last Hunger Games, but Peeta is very, very changed. Now all Katniss can think about is killing President Snow.
If you haven't read the book. Don't do the jump.