Catching Fire by Suzanne Collins

The second in the Hunger games trilogy. After winning the 74th Hunger Games in the previous novel, Katniss Everdeen and Peeta Mellark return home to District 12, the poorest sector in the fictional country of Panem. On the day that Katniss and Peeta are to start a "victory tour" of the country, she is visited by President Snow. President Snow explains that he is angry at her for threatening to commit suicide with Peeta at the end of the Hunger Games, which permitted them both to win. President Snow tells Katniss that when she defied the Capitol, she created talk of rebellion in the districts. He threatens to kill her family and friends if she cannot prove to everyone in Panem that her act was not one of defiance, but that she was instead driven by an intense love for Peeta.