The first Harry Potter book begins at Number 4, Privet Drive. Harry is ten, and he lives with his aunt and uncle on his mother's side. They are his only living relatives, as Harry's parents were killed in a car crash when he was only 1 (this is what the Durselys tell him, it's not really true). Harry also has a cousin, named Dudley. The whole family bullies Harry, and treats him as if he's their servant. Harry has a miserable life. One day, when the Durselys and Harry were eating breakfast, a letter came in the mail for Harry. He had never gotten a letter before, but Uncle Vernon steals the letter before Harry can read it. This is because the letter is from Hogwarts School of Witchcraft and Wizardry. Letters for Harry arrive in greater numbers every day, until when about 50 letter arrive on a Sunday Uncle Vernon decides everyone is leaving. They travel to a very remote island in England, but that morning, Hagrid turns up. It is actually Harry's eleventh birthday, and Hagrid (the gamekeeper at Hogwarts) delivers Harry's letter to him. It is a letter saying he has been accepted at Hogwarts, but Harry has no idea what Hogwarts is. Hagrid tells him that is where his parent's learned everything, but Harry doesn't realize his parents were a witch and a wizard. Hagrid tells Harry he is a wizard, and they leave the Dursleys and go to Hogwarts for the start of the term. Harry also didn't know that his parents were killed by an evil Dark Wizard named Voldemort. When Voldemort tried to kill Harry, Voldemort's powers were gone and he was reduced to being almost dead. Voldemort had scared everyone for many years, so Harry is famous for defeating him, even though he wasn't gone forever.
When Harry arrives at Hogwarts, he makes friends with Ron Weasly, and shortly thereafter they become friends with Hermonie Granger. Their year is very eventful, but I'm not going to try to explain it all here, it would take too long!! :) In the end though, Harry meets Lord Voldemort again. The ending is fantastic, and I would recommend this book (and the whole series) to anyone! I hope you read Harry Potter if you haven't already; it is fantastic!