Chapter 1 - "The Riddle House" - In which we learn of the mysterious murders in the [Riddle House] fifty years ago, how [Frank Bryce] was accused but released for lack of evidence, and how the [Riddle House] fell into disrepair. In the present, Frank interrupts a sinister meeting and is killed when he overhears Voldemort's plans.
We learn about the village of Little Hangleton and the old, abandoned [Riddle House]. It was there that, fifty years ago, all three of the Riddles were killed, and though gardener [Frank Bryce] was blamed by many villagers, he was eventually set free by the police when the autopsy revealed the family had not been murdered.
The Murder of Frank Bryce
One night fifty years later, [Frank Bryce] is still the gardener at the [Riddle House], and seeing lights on in the house at night, he enters the building and climbs the stairs, creeping up to the room unheard.
With [Frank Bryce] listening outside, Voldemort and Wormtail converse about having killed Bertha Jorkins, using Harry Potter for something, and plotting another murder. Soon, though, a [snake] slithers by, and Voldemort and Wormtail confront Frank, barely listening to his accusations before killing him too, awakening Harry many miles away.
Chapter 2 - "The Scar" - In which Harry awakens from a bad dream, his scar burning, we recap Harry's previous adventures, and he writes a letter to his godfather.
Harry awakens suddenly, still thinking about his vision of Voldemort and Wormtail and wondering who he can tell about his [scar] hurting. Meanwhile, we learn of Harry's life, his love of [Quidditch], and of his having to live with the [Dursleys]. Finally, Harry realizes the solution to his dilemma, deciding to write to his godfather, Sirius Black.
Harry pens a letter to Sirius about his [scar], as we learn of Sirius's backstory and the way in which he came into Harry's life the previous year. Finally, Harry finishes writing, and heads down to breakfast.
Chapter 3 - "The Invitation" - In which Dudley and the rest of the Dursleys are on a diet, and the Dursleys receive a letter from Mrs. Weasley inviting Harry to stay with her family and attend the Quidditch World Cup final.
At breakfast Harry finds the [Dursleys] in a quiet, sulky mood, owing largely to the new diet imposed on [Dudley] by his school nurse. As they eat breakfast, the doorbell rings, and [Vernon] answers it; shortly thereafter he orders a confused Harry out into the living room with him.
[Uncle Vernon] presents a bewildered Harry with a letter he received from Mrs. Weasley, inviting him to the [Quidditch World Cup], and absolutely covered with stamps. Finally, under Harry's threat of writing to Sirius, Vernon hesitantly agrees to let Harry go to the World Cup with the Weasleys.