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The Hunger Games by Suzanne Collins
The Hunger Games follows 16-year-old Katniss Everdeen, a girl from District 12 who volunteers for the 74th Hunger Games in place of her younger sister Prim. Also participating from District 12 is Peeta Mellark, a boy who developed a secret lifelong crush on Katniss the moment he laid eyes on her as a child. They are mentored by District 12's only living victor, Haymitch Abernathy, who won the Games 24 years earlier and has since assumed a solitary life of alcoholism. Peeta professes his love for Katniss in a television interview prior to the Games, leading the Capitol to portray Katniss and Peeta as "star-crossed lovers". This revelation surprises Katniss, who actually harbors feelings for her hunting buddy back home, Gale Hawthorne. Haymitch advises Katniss to play along and act in love with Peeta, in order to gain wealthy sponsors who can gift them supplies during the Games. In the arena, Katniss develops an alliance and friendship with a young tribute from District 11 (Rue) and is emotionally scarred when she is killed while acting as a decoy. Katniss devises an impromptu memorial for Rue as an act of defiance toward the Capitol. More than halfway through the Games, the remaining tributes are alerted to an unprecedented rule change that allows both tributes from the same district to be declared victors if they are the final two standing. After learning of the change, Katniss and Peeta begin to work as a team and spare each others' lives. When all of the other tributes are dead and they appear to win the Games together, the provision is reversed at the last moment, requiring one to kill the other. Katniss quickly devises a plan for herself and Peeta to commit double-suicide (denying the Capitol of its precious victor), but they are stopped by the Gamemakers and both return home victorious. During and after the Games, Katniss indeed develops strong feelings for Peeta and struggles to balance them with the connection she feels with Gale. When it becomes clear the Capitol is upset with her defiance, Haymitch encourages Katniss to keep up (and even accelerate) the 'star-crossed lovers' act, without telling Peeta.

1. The Hunger Games
2. Catching Fire
3. Mockingjay