What is the main content of The Kite Runner?

The novel The Kite Runner tells the story of an Afghan immigrant boy's childhood in the United States from the first-person perspective, and the process of his spiritual redemption for his childhood mistakes as an adult. Amir, the hero, was born in a wealthy family in Kabul on 1963. His father is a successful carpet dealer. Hassan, son of Amir's servant Ali, was born in Hazara. Amir and Hassan are good friends. They often play games together. Amir is an excellent "kite fighter", that is, he is good at cutting the string of others' kites with his own kite; Hassan is an outstanding "kite runner" because the tradition in Afghanistan is that the kite that falls after the thread is cut belongs to the person who catches it. Dad loves two children, but he thinks Amir is too timid. Hassan always stands out when two children fight with others. Amir showed his writing talent, but dad didn't pay attention to it. Because of the selfishness of the children, the hero wants to get all the love of his father, so he is always jealous of his father's warmth to his servants and children. The protagonist's childhood character was weak, the servant's children were brave and loyal, and the protagonist with unbalanced mentality later framed the servant family by disgraceful means, which led to the servant family living in a foreign land. Then a war broke out in Afghanistan, and the protagonist's family was forced to leave the United States. Later, my father's partner was familiar with the inside story. Before he died, he encouraged the hero to go back to Afghanistan to find his servants and children. Through his own efforts, he calmed down his guilt for many years and learned a shocking lie from Rahim Khan, who was seriously ill. Hassan is actually the illegitimate child of his father, that is, his childhood partner is actually his brother. Hassan's son, his nephew, was bought by assef from an orphanage. The nightmare of childhood recurred again. Finally, he went through hardships, rescued his nephew and brought him back to his home in America.

The Kite Runner is the first novel by Khaled Husseini, an Afghan-American writer, and the first English novel by an Afghan-American writer. Published in 2003, it ranked first in The New York Times bestseller list for two consecutive years, with global sales exceeding 20 million copies and translated into 42 languages. The novel tells the story of friendship, affection, betrayal and redemption between two Afghan teenagers. The novel not only expresses the accusation of war, but also profoundly reflects the ethnic and religious problems in Afghanistan. This novel has been widely praised by critics, but it has also caused great controversy in Afghanistan. The language of this novel is pure, but it is sincere and touching. It has brought surprises to the American publishing industry from the beginning of Lovely Bones, and it has been made into a movie by DreamWorks.