Chapter 1 - "Owl Post" - In which we are reminded of Harry's previous adventures and told of his summer holidays, he receives birthday cards and presents from his friends, and Harry learns what Ron and Hermione did during the summer.

Homework at Midnight
We learn about the [Dursleys] and their having taken Harry's schoolbooks away for the summer.
Ron attempts to call Harry on the telephone, but in screaming into the phone outrages [Uncle Vernon] instead.
Harry thinks back at how Ron and Hermione have not contacted him for the summer, continues working on his homework, and suddenly realizes that it's his thirteenth birthday.
We learn about Harry's appearance, his scar, and his experience learning that he was a wizard and then twice encountering Voldemort.
Looking out the window, Harry spots Hedwig, flying toward him with another owl and carrying an unconscious Errol between them. They are each carrying packages, and one of them also has his new Hogwarts letter.
The package from Ron delivers news that the Weasleys have taken a trip to Egypt, along with an apology from Ron for the disasterous phone call and a Pocket Sneakoscope as a birthday present.
Harry then reads Hermione's letter, where she tells about her vacation in France, and opens her present - a Broomstick Servicing Kit.
We learn about how much Harry likes [Quidditch], and the fact that he's very talented at it.