Hermione doesn′t stop nagging them about the Half-Blood Prince. In her opinion the book belonged to Eileen Prince, but Harry doesn′t want to hear anything about this. He wants to get the book back.
While he deliberates the problem he gets a letter from Dumbledore, who asks him to come to his office right away. A few moments later Harry runs there. On his way to the headmaster′s office he meets Professor Trelawney who is really confused. She talks about the Room of Requirement and that someone was in it when she wanted to get in. In the conversation Harry finds out that Professor Snape listened in on Professor Dumbledore and Professor Trelawney when the later told the headmaster the prophecy about him and Voldemort.
Albus Dumbledore asks Harry to accompany him to destroy the next Horcrux. But Harry is only allowed to come with him if he accepts that he has to do exactly what Dumbledore says without any exception.
After Harry accepted the conditions he tells Dumbledore everything he had heard from Professor Trelawney. Harry tries to attract Dumbledore′s attention to the fact that Snape and Draco are up to something, but Dumbledore waves this aside, annoyed.
When Harry gets his Invisibility Cloak he tells Hermione and Ron exactly what he has heard and asks them to keep an eye on themselves. He gives them Marauder′s Map and the rest of the Felix Felicis potion.
