Throughout the three previous novels in the "Harry Potter" series, the main character, Harry Potter, has struggled with the difficulties of growing up and the added challenge of being a famed wizard. When Harry was a baby, Lord Voldemort, the most powerful dark wizard in history, killed Harry's parents but was mysteriously defeated after unsuccessfully trying to kill Harry, though his attempt left a lightning-shaped scar on Harry's forehead. This results in Harry's immediate fame and his being placed in the care of his abusive Muggle (non-magical) aunt and uncle, Petunia and Vernon Dursley, who have a son named Dudley.