harry potter and the half blood prince who is the half blood prince
Harry Potter and the Half-Blood Prince Near the end of the year, Harry and Dumbledore journey to a cave to retrieve a suspected Horcrux, Slytherin's locket. Dumbledore expertly finds a secret passageway to a large, pitch black underground lake, which Harry and Dumbledore cross in a small boat to an island in the centre. The locket is at the bottom of a basin on the island, and can only be reached by drinking the potion above it. Harry aids Dumbledore, who drinks the potion, causing him hallucinations and immense pain. Though Dumbledore is severely weakened after finishing the potion, together the two manage to fight off Voldemort's Inferi that have been hiding in the lake. They take the locket and return to Hogwarts, to find that the Dark Mark has been placed over the highest school tower in their absence. Harry and Dumbledore ascend to the tower where they are ambushed by Draco Malfoy, accompanied by Death Eaters that he helped get inside Hogwarts. Dumbledore freezes Harry under his Invisibility Cloak with a body-bind spell, to keep him hidden. Draco disarms Dumbledore of his wand and then threatens to kill him, which turns out to have been his mission from Voldemort all along. Draco is unable to go through with it and when Snape arrives, he casts the spell to kill Dumbledore instead. Harry ignores the battle raging in Hogwarts to pursue Dumbledore's killer. Snape successfully fights Harry off, and he reveals that he is in fact the Half-Blood Prince before he, Draco, and the rest of the Death Eaters escape.