<P> 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 . </P>
<P> 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 . </P>
harry potter and the half blood prince who is the half blood prince
harry potter and the half blood prince who is the half blood prince
Snape
Snape