survive the fight with Assef. Amir drifts in and out of consciousness as Assef beats him, and Sohrab comes to the rescue. Sohrab hits Assef in the eye with his slingshot, and both Sohrab and Amir run to Farid's car. Note the significance of this altercation: Amir has finally stood up to Assef, and in a way, stood up for Hassan, by defending Sohrab.

As Amir learns about Sohrab's life and what he has gone through, Amir becomes determined to adopt him. In Chapter 24, Amir asks Sohrab if this is what he wants. So the next challenge becomes: Amir must find a way to adopt Sohrab and bring him to America. Amir goes to the American embassy, where he is told that adoption is essentially impossible without valid death certificates proving Sohrab is an orphan. Sohrab would have to stay in an orphanage while adoption paperwork processes, which could take up to two years. When Amir tells Sohrab he might have to stay in an orphanage, Sohrab screams and cries out of fear. Soraya tells Amir that she has a family member who works for US Immigration and can keep Sohrab in America once he is there. Amir goes to tell Sohrab, who is found bleeding and unconscious in a bathtub.

In Chapter 25, Sohrab recovers in the hospital but stops speaking all together. Amir takes Sohrab to San Fransisco. As the novel ends, the ultimate challenge becomes helping Sohrab heal from the emotional aftermath of losing his parents and from his traumatizing experience with the Taliban. Going back to Amir accepting double responsibility and Sohrab's sexual abuse: by taking in Sohrab and helping him heal emotionally, Amir is finally redeeming himself for his betrayal of Hassan.

Your question is not very specific, but I assume that you are referring to Amir's trip to Pakistan to see Rahim Khan and his resulting return to Afghanistan. After learning the news from Rahim that Hassan and his wife have been killed, he discovers two important life-changing facts: Rahim tells him that Hassan is actually his half-brother, fathered by Baba; and that Hassan has a son, Sohrab--Amir's half-nephew--who is somewhere in Afghanistan. Rahim explains to Amir that "there is a way to be good again." If he can find Sohrab and return him to safety, it will allow Amir to ease his conscience about his betrayal of Hassan as a youth.

But it will not be an easy journey. He must travel into Taliban-held Afghanistan, no easy feat. He must hire a trustworthy guide and disguise himself, since the Taliban often beat or kill men with no beards. He must find Sohrab, since he is no longer at the orphanage he visits. Once he learns that Sohrab is being held by the Taliban, he must find a way to bribe them in order to obtain his release. If all of the above is accomplished, he must find a way to escape Afghanistan and then find a proper home (or obtain a visa) for Sohrab.