The Kite Runner by Khaled Hosseini

The Kite Runner follows the story of Amir, the privileged son of a wealthy businessman in Kabul, and Hassan, the son of Amir's father's servant. As children in the relatively stable Afghanistan of the early 1970s, the boys are inseparable. They spend idyllic days running kites and telling stories of mystical places and powerful warriors until an unspeakable event changes the nature of their relationship forever, and eventually cements their bond in ways neither boy could have ever predicted. Even after Amir and his father flee to America, Amir remains haunted by his cowardly actions and disloyalty. In part, it is these demons and the sometimes impossible quest for forgiveness that bring him back to his war-torn native land after it comes under Taliban rule.