Dumbledore instructs Harry to hide and not to interfere no matter what happens. Draco arrives in the Astronomy Tower and disarms Dumbledore revealing that he has been chosen by Voldemort to kill the headmaster. When Draco is unable to bring himself to do it, Snape casts the killing curse instead, killing Dumbledore, who falls from the tower. Harry confronts and attacks Snape, but Snape overpowers him, and reveals himself as the Half - Blood Prince before escaping. Harry returns to Hogwarts, where the students, staff, and a few guests mourn Dumbledore 's death. Harry later reveals to Ron and Hermione that the locket Horcrux was a fake. The locket contains a message from "R.A.B. '', stating that he has stolen the real Horcrux with the intent of destroying it. Rather than returning for their final year at Hogwarts, the three decide to hold out, and track down the remaining Horcruxes.
who was the half blood prince in harry potter
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