A few seconds later they were in the astronomy Tower.

"We have to get you to the hospital wing sir. To Madam Pomfrey." she said tired.

"No, Severus, get Severus." Dumbledore said.

"But sir."

"Harriet do what I say, trust me." he said interrupting her.

So she headed to the stairs.

When she was on her way there she heard Dumbledore say something.

"Good evening Draco."

"Who were you just talking to?" Malfoy said.

"I was just talking to myself. Have you always been to yourself Draco? Draco, you are assassin."

"How do you know what I am? I've done things that shock you."

"Oh, like cursing Katie Bell and hoping that in return she would bear a cursed necklace to me? Like replacing a bottle of mead with one lace with poison. Forgive me, Draco, I cannot help feel these actions are so weak that your... heart can't really have been in." Dumbledore said.

"He trust me. I was chosen!" Malfoy said and took out his mark.

"I shall make it easy for you." Dumbledore said.

"Expelliarmus!"

Then Dumbledore's wand fell out of his hand.

"Very good, very good. You're not alone. There are others. How?"

"The vanishing Cabinet in the Room of Requirements. I've been mending it."

"I'm guessing it has a sister."

"A twin. In Borgin and Burkes. They form a passage." Malfoy said.

"Ingenious. Draco, years ago, I knew a boy who made all the wrong choices. Please let me help you."

"I don't want your help. Don't you understand? I have to do this. I have to kill you. Or he's gonna kill me." he said scared.

"Well look who we have here. Well done Draco." Bellatrix said.

Harriet pointed her wand but then saw Snape. He put a finger on his lips telling her to stay quiet. So she looked back up.

"Good evening, Bellatrix. I think introductions aren't over, don't you?" Dumbledore said.

"Love to, Albus, but I'm afraid we're on a bit of tight schedule. Do it!" she said.

"He doesn't have the stomach. Just like his father. Let me finish him in my own way." someone else said.

"No, the Dark Lord was clear the boy has to do it. This is your moment, Draco. Do it! Go on, Draco, now!" Bellatrix said.

"No." Snape said.

"Severus. Please..." Dumbledore said.

He took out his wand and said,

"Avada Kedavra."

Harriet stood there in shock.

Then she came back and started running after Snape.

When she got there Bellatrix was starting Hagrid's hut on fire.

"Snape!" she yelled.

He turned around and saw Harriet running to him.

"He trusted you!" she yelled.

"Go on!" Snape said to Bellatrix.

"Incarcerous!" she yelled.

He just waved the spell away from himself with his wand.

"Fight back, you coward! Fight back!"

Then Bellatrix aimed a curse at Harriet.

"No, she belongs to the Dark Lord." Snape said.

She frowned and turned around.

"Sectumsempra!" she yelled.

Snape just pushed it back like before.

"You dare use my own spells against me?"

Harriet sat up.

"Yes Potter, I'm the halfblood Prince."

When Snape was gone Harriet walked to Dumbledore's body.

When she got there she sat down next to him and started crying a little. Then Neville came over and grabbed her side and she cried on his shoulder.

McGonagall raised her wand and some light went off.

Everyone else did the same thing.

The next day Harriet was in Dumbledore's office.

"Potter." someone said.

She turned around and saw McGonagall.

"Enlighten of recent events, if you should have the need to talk to someone..."

Harriet started leaving.

"You should know," She looked at her and listened. "You meant a great deal to him."

Later that night Harriet, Ron, Neville and Hermione were outside on the balcony.

"Did you think he would have done it, Draco?" Hermione asked.

"No. No he was lowering his wand. It was Snape. It was always Snape. But I did nothing." Harriet said.

She handed Hermione the locket.

"It's fake. Open it." she said.

She opened it and unfolded the paper.

"To the Dark Lord,

I know I will be dead long before you read this but I want you to know that it was I who discovered your secret. I have stolen the real Horcrux and intend to destroy it as soon as I can. I face death in the hope that when you meet your match, you will be mortal once more.

R.A.B

"R.A.B?" she said.

"I don't know. But wherever they are they have the real horcrux. Which means it was all a waste." Harriet said.

Then they turned around and leaned on arm.

"I'm not coming back Hermione. I've got to finish whatever Dumbledore started. And I don't know where that will leave me. But I'll let you know where I am when I can." Harriet said.

"I've always admired your courage, Harriet. But sometimes, you can be really thick. You don't really think you're going to be able to find all those horcruxes by yourself, do you? You need us, Harriet." Hermione said.

She just sat there quietly and looked at the school.

"I never realized how beautiful this place was." Harriet said.

'Even though I call it home.' she thought.

Then they saw Fawkes flying by.

They were going to be busy next year. But to end the war they'll do anything.