Harry and his two friends, Ron and Hermione, show themselves to be brave when they fight and defeat a troll (an ugly, stupid gian) who has been let into the school by the evil teacher called Quirrell. Quirrell has in fact been taken over (possessed) by the evil wizard Voldemort, who is now living inside Quirrell's body and is trying to find the Philosopher's Stone a magic stone which can turn ordinary metals into gold and can give the owner immortality. The Philosopher's Stone is in fact hidden in Hogwarts School In the climax to the story, Harry fights and defeats with the help of kind of wizard Dumbledore the evil wizard, Voldemort, and the Philosopher's Stone is destroyed. Harry looks forward to returning to his uncle, aunt and cousin in the school holidays, where he plans to practise on them some of the magic he has learned! and Extract from Harry Potter and the Philosopher's Stone