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.
Don't be fooled by the many videos claiming to be the movie trailer (those are just fan videos) because, for the mean time, only a few sites like MSN have been given the exclusive use of the true trailer.
