Harry Potter's sixth year at Hogwarts School of Witchcraft and Wizardry is colored by two truths: Lord Voldemort is wreaking havoc on much of Britain and teenage hormones are fully raging. In this penultimate story in the saga of the Boy Who Lived, Harry finds a mysterious potions book bearing the inscription "Property of the Half-Blood Prince." As he begins to use its custom-made instructions and spells, he excels at potions but also begins to learn about the ambiguity of most magic. He also embarks on private lessons with Professor Dumbledore, who takes him on a journey through memory lane to unravel the mystery of Voldemort's past and, later, his immortality.

     Further complicating things are Apparition lessons, bitter jealousy between Ron and Hermione, and Harry's budding realization that Ginny is attractive. Teenage problems then take a backseat as 'Half-Blood Prince' rockets toward its unbelievable conclusion, which places Harry at the front lines of the escalating war. And on those front lines, casualties inevitably occur...

Source: IMDb

     Voldemort is tightening his grip on both the Muggle and wizarding worlds and Hogwarts is no longer the safe haven it once was. Harry suspects that dangers may even lie within the castle, but Dumbledore is more intent upon preparing him for the final battle that he knows is fast approaching. Together they work to find the key to unlock Voldemort's defenses and, to this end, Dumbledore recruits his old friend and colleague, the well-connected and unsuspecting bon vivant Professor Horace Slughorn, whom he believes holds crucial information. Meanwhile, the students are under attack from a very different adversary as teenage hormones rage across the ramparts. Harry finds himself more and more drawn to Ginny, but so is Dean Thomas. And Lavender Brown has decided that Ron is the one for her, only she hadn't counted on Romilda Vane's chocolates! And then there's Hermione, simmering with jealously but determined not to show her feelings. As romance blossoms, one student remains aloof. He is determined to make his mark, albeit a dark one. Love is in the air, but tragedy lies ahead and Hogwarts may never be the same again.

Source: WB Press Release