Directed by David Yates. In Harry's sixth year at Hogwarts School of Witchcraft and Wizardry, Lord Voldemort and his Death Eaters are increasing their terror upon the Wizarding and Muggle worlds.Albus Dumbledore persuades his old friend and colleague Horace Slughorn to return to Hogwarts as a professor as there is a vacancy to fill. However, there is a more important reason for Slughorn's