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In The Half-Blood Prince , Lord Voldemort's grip on both the Muggle and wizarding worlds tightens, and Hogwarts is no longer a safe haven. Harry suspects dangers lie within the castle, but Dumbledore is more intent on preparing him for the final battle. Together, they explore Voldemort's past, seeking the key to his defenses, while Harry discovers a mysterious old textbook belonging to the "Half-Blood Prince" that helps him excel in Potions. How you can stream the Harry Potter films, wherever you are