Chapter 5 - "The Dementor" - In which the students leave the Leaky Cauldron for Hogwarts, board the train, discuss Hogsmeade and a sleeping Professor Remus Lupin prevents a fight with Malfoy. The train is boarded by Dementors, Harry passes out, McGonagall wants a word with Harry and Hermione and Hagrid is the new Care of Magical Creatures teacher.
Glorious Days in Diagon Alley
Harry goes into [Flourish and Blotts] to buy his books, and discovers that the [manager] is frustrated over selling [The Monster Book of Monsters]. He also sees a large dog on the cover of a book about death omens, and recognizes it as the one he saw just before the [Knight Bus] nearly ran him over.
Ron and Hermione finally spot Harry and they meet up at [Florean Fortescue's]. He admits to blowing up [Aunt Marge], Ron shows off his new wand, and Hermione decides to buy an owl, so the group sets off for [Magical Menagerie].
In [Magical Menagerie], as Hermione looks at owls, Ron buys some [rat tonic] for Scabbers and then gets attacked by a huge cat named Crookshanks, causing Scabbers to bolt from the store and Ron and Harry to give chase.
An Evening with the Weasleys
Harry quickly passes Fred and George, who are altering Percy's [Head Boy] badge, delivers the [rat tonic] to Ron, and thinks about how Sirius Black is after him, and what it will mean for his school year.