their son, Dudley, were Harry's only living relatives. They were
Muggles, and they had a very medieval attitude toward magic. Harry's dead parents, who had been a witch and wizard themselves, were never mentioned under the Dursleys' roof For years, Aunt Petunia and Uncle Vernon had hoped that if they kept Harry as downtrodden as possible,
they would be able to squash the magic out of him. To their fury, they
had been unsuccessful. These days they lived in terror of anyone finding out that Harry had spent most of the last two years at Hogwarts School
of Witchcraft and Wizardry. The most they could do, however, was to lock away Harry's spellbooks, wand, cauldron, and broomstick at the start of the summer break, and forbid him to talk to the neighbors.

This separation from his spellbooks had been a real problem for Harry, because his teachers at Hogwarts had given him a lot of holiday work.
One of the essays, a particularly nasty one about shrinking potions, was
for Harry's least favorite teacher, Professor Snape, who would be
delighted to have an excuse to give Harry detention for a month. Harry
had therefore seized his chance in the first week of the holidays. While Uncle Vernon, Aunt Petunia, and Dudley had gone out into the front garden to admire Uncle Vernon's new company car (in very loud voices, so that the rest of the street would notice it too), Harry had crept downstairs, picked the lock on the cupboard under the stairs, grabbed some of his books, and hidden them in his bedroom. As long as he didn't leave spots of ink on the sheets, the Dursleys need never know that he was studying magic by night.

Harry was particularly keen to avoid trouble with his aunt and uncle at the moment, as they were already in an especially bad mood with him, all because he'd received a telephone call from a fellow wizard one week into the school vacation.

Ron Weasley, who was one of Harry's best friends at Hogwarts, came from a whole family of wizards. This meant that he knew a lot of things Harry didn't, but had never used a telephone before. Most unluckily, it had been Uncle Vernon who had answered the call.

"Vernon Dursley speaking."

Harry, who happened to be in the room at the time, froze as he heard Ron's voice answer.