The Hunger Games: Catching Fire
Here she comes again. Now that she's 15, what could happen? Now that she's gotten so much stronger, what will she do? She's in the dark about President Snow's despise for her, so how will she ever know? Not even Peeta knows. But if she never knows, she'll be killed soon. It's a threat from President Snow, another thing she has no clue about. He wants her killed. In another Hunger Games. They even had to cancel The Games for a few years, trying to come up with a plan.
Note - Peeta is 16 in this book.