The Mockingjay by Suzanne Collins
This was a great ending to this trilogy. The suspense and action was kept up throughout the entire series. The ending was "as it should be" I think.
One of the things I liked best was that by writing through the voice of Catniss, the whole series had a whirlwind feel to it. Just like it would feel for a 17 year old to be ripped from her reality and thrust into all these varied experiences against her will. Also, in losing the closeness she shared with Gale, she lost her grounding wire so she was feeling completely isolated and alone.
This would be a great series to begin discussions of government, types of government and their role in the lives of the people as well as a discussion of the responsibility of the people when the government is not acting on their best interest. A very fun and fast read.