Harry Potter and the Sorcerer's Stone by J.K. Rowling

Harry Potter's life is miserable. His parents are dead and he's stuck with his heartless relatives, who force him to live in a tiny closet under the stairs. But his fortune changes when he receives a letter that tells him the truth about himself: he's a wizard. A mysterious visitor rescues him from his relatives and takes him to his new home, Hogwarts School of Witchcraft and Wizardry.