Story runs in a remote Afghanistan village. Between 2 best friends. Turns out that 1 friend is a really really close relative to him. That friend who comes to know that he is a really really close relative to him will feel guilty about how he treated him in their childhood. You should read the book to know about how he makes up to that guilty feeling. I love the narrative style Khaled Hosseini. Must read. Carry tissues if you are too sensitive.