The day after his birthday party, Amir opens all his presents. He gets two from Baba: a Schwinn Stingray, which is "the king of all bicycles," and a brand-new wristwatch (9.2). He throws most of his gifts in the corner because he realizes Baba wouldn't have thrown him such a lavish party if he hadn't won the kite-fighting tournament. So, they feel a little like "blood money" (9.1).
Ali and Hassan give Amir a really nice hardback copy of Shahnamah. It probably took some scrimping and saving on Ali and Hassan's part to afford this present.
In the lowest of all low deeds, Amir puts his new wristwatch and a wad of cash under Hassan's mattress. He tells Baba his stuff is missing. Baba talks to Ali; Ali finds Amir's stuff in their house. The two return to Baba's house, having had a good cry together. Baba asks Hassan if he stole the watch and money. Surprisingly enough – even for Amir – Hassan says, "Yes." Baba immediately forgives Hassan, which again surprises Amir. Isn't theft the worst of all sins? In any case, Ali and Hassan decide to leave.
Baba pleads with Ali to stay. Ali refuses.
In the pouring rain (dramatic, right?), Baba drives Ali and Hassan to the bus station. Amir considers running out to the car to confess, but he stays at the window.