The remains of district 12, Katniss Everdeen, the main character is looking around. Wondering what happened.
Peeta is successfully rescued from the Capital but they hijacked his brain with jacker venom, so ever time he see Katniss he tries to kill her! All the troops are sent to the out skirts of the Capitol and the "Star Squad" is sent on a mission to the President mansion and get in to kill President Snow.
Katniss is fighting against herself because she has to make so many big decisions about being the symbol of rebellion for all of the Districts that are against the Capitol.
Katniss becoming the Mockingjay is to bring down the Capitol and to kill Snow so justice can be served to the districts. The climax in the book takes place in the Capitol on the balcony of Snow's mansion.
Katniss is now living temporarily in the mansion until she kills Snow.
The theme of this book is that people act differently than what they want to act like. Katniss had to do symbolize everyone that disagreed with the capitol but she just wanted to standby everyone and not be the center of attention.