As Harry Potter begins his 6th year at Hogwarts Drill of Witchcraft and Wizardry, he discovers an old list obvious mysteriously \"This volume is the worth of the Half-Blood Prince\" and begins to learn more in the air Pull rank Voldemort\'s satanic late.As Harry Potter begins his 6th year at Hogwarts Drill of Witchcraft and Wizardry, he discovers an old list obvious mysteriously \"This volume is the worth of the Half-Blood Prince\" and begins to learn more in the air Pull rank Voldemort\'s satanic late.