The hottest day of the summer so far was drawing to a close and a drowsy silence lay over the large, square houses of Privet Drive.
Plot: Dementors turn up at Privet Drive and Harry is forced to use magic to protect himself and Dudley.
But he's called to a trial by the Ministry of Magic who want to expel him for using magic outside Hogwarts.
Then Harry is taken to Grimmauld Place - Sirius' family home where finds out about the Order of the Phoenix - a group of adults made up of people like the Weasleys, Sirius, Snape and Tonks - who have formed to fight the recently-resurrected Voldemort.
Harry is finally let off at his trial but it's a close call.
They go back to Hogwarts and meet pupil loony Luna Lovegood and evil teacher Professor Umbridge.
Harry and his friends set up a secret group called Dumbledore's Army to help the adults fight Voldemort.
Throughout all this, Harry goes on a date with Cho Chang, but their relationship goes wrong.
It ends with a big showdown between Harry and his friends, and Voldemort and his supporters at the Ministry of Magic, when Sirius is tragically killed. Harry ends up facing Voldemort but Dumbledore steps in and saves the day.
Later Dumbledore explains all about the 'prophecy' to Harry - which was made just before Harry was born. It said a boy born at the end of July would be the only person who could vanquish the Dark Lord so he tried to kill Harry. Neville was also born then, but Voldemort believes it was Harry.
It ends with all the 'good' people preparing to fight Voldemort, who everyone knows is now definitely back.
DADA teacher (and their fate): The VERY evil Professor Umbridge. She is eventually taken off by the centaurs in the forest, traumatised and leaves Hogwarts.
Best Neville moment: When Neville finally comes into his own and masters spells in the Dumbledore's Army sessions, desperate to avenge his parents' injuries at the wand of Voldemort's supporters.
Last line: Instead, he smiled, raised a hand in farewell, turned around led the way out of the station towards the sunlit street, with Uncle Vernon, Aunt Petunia and Dudley hurrying along in his wake.