Chapter 19 Amir searches to his nephew.

Amir was convinced by Rahim khan to search Sohrab. In spite of his pain, Amir decided to do his best effort to recover the son of his half-brother. This is the perfect opportunity to do the good things and give back all the facts that Hassan had done for Amir in their childhood.
Amir took a taxi, which was driven by Farid. The driver arrived to his house in Afghanistan. In this house, Amir lived the difficult situatuion that all the Hazaras had in Afghanistan.

The search was complicated because Sohrab was orphan and Amir only had a photograph where Farzana, Amir and Sohrab appeared which did the search more difficult. When they were searching in Kabul, Amir felt like a stranger because he had not visited Kabul for many years.
In my opinion these events can recover the bad things that Amir did to Hassan when he was a child. This is the opportunity that Amir was waiting.