Harry Potter and the Half-Blood Prince

'As Harry Potter begins his 6th year at Hogwarts School of Witchcraft and Wizardry, he discovers an old book marked mysteriously \"This book is the property of the Half-Blood Prince\" and begins to learn more about Lord Voldemort\'s dark past.'

Harry James Potter is the titular character and the protagonist of J. K. Rowling's Harry Potter fantasy series. The books cover seven years in the life of the lonely orphan who, on his eleventh birthday, learns he is a wizard. He attends Hogwarts School of Witchcraft and Wizardry to learn magic. Under the guidance of the kind headmaster Albus Dumbledore, Harry discovers that he is already famous throughout the wizarding world, and that his fate is tied with that of Lord Voldemort, the universally feared Dark wizard who killed Harry's father and mother.

Source: Wikipedia