“‘I have stolen the real Horcrux and intend to destroy it as soon as I can.’” Harry read out.

“Well, what if he did finish it off?” said Ron.

“Or she,” interposed Hermione.

“Whichever,” said Ron. “it’d be one less for us to do!”

“Yes, but we’re still going to have to try and trace the real locket, aren’t we?” said Hermione, “to find out whether or not it’s destroyed.”

“And once we get hold of it, how do you destroy a Horcrux?” asked Ron.

“Well,” said Hermione, “I’ve been researching that.”

“How?” asked Harry. “I didn’t think there were any books on Horcruxes in the library?”

“There weren’t,” said Hermione, who had turned pink. “Dumbledore removed them all, but he—he didn’t destroy them.”

Ron sat up straight, wide-eyed.

“How in the name of Merlin’s pants have you managed to get your hands on those Horcrux books?”

“It—it wasn’t stealing!” said Hermione, looking from Harry to Ron with a kind of desperation. “They were still library books, even if Dumbledore had taken them off the shelves. Anyway, if he really didn’t want anyone to get at them, I’m sure he would have made it much harder to—”

“Get to the point!” said Ron.

“Well… it was easy,” said Hermione in a small voice. “I just did a Summoning Charm. You know—Accio. And—they zoomed out of Dumbledore’s study window right into the girls’ dormitory.”

“But when did you do this?” Harry asked, regarding Hermione with a mixture of admiration and incredulity.

“Just after his—Dumbledore’s—funeral,” said Hermione in an even smaller voice. “Right after we agreed we’d leave school and go and look for the Horcruxes. When I went back upstairs to get my things it—it just occurred to me that the more we knew about them, the better it would be… and I was alone in there… so I tried… and it worked. They flew straight in through the open window and I—I packed them.”

She swallowed and then said imploringly, “I can’t believe Dumbledore would have been angry, it’s not as though we’re going to use the information to make a Horcrux, is it?”

“Can you hear us complaining?” said Ron. “Where are these books anyway?”

Hermione rummaged for a moment and then extracted from the pile a large volume, bound in faded black leather. She looked a little nauseated and held it as gingerly as if it were something recently dead.

“This is the one that gives explicit instructions on how to make a Horcrux. Secrets of the Darkest Art—it’s a horrible book, really awful, full of evil magic. I wonder when Dumbledore removed it from the library… if he didn’t do it until he was headmaster, I bet Voldemort got all the instruction he needed from here.”

“Why did he have to ask Slughorn how to make a Horcrux, then, if he’d already read that?” asked Ron.

“He only approached Slughorn to find out what would happen if you split your soul into seven,” said Harry. “Dumbledore was sure Riddle already knew how to make a Horcrux by the time he asked Slughorn about them. I think you’re right, Hermione, that could easily have been where he got the information.”

“And the more I’ve read about them,” said Hermione, “the more horrible they seem, and the less I can believe that he actually made six. It warns in this book how unstable you make the rest of your soul by ripping it, and that’s just by making one Horcrux!”

Harry remembered what Dumbledore had said about Voldemort moving beyond “usual evil.”

“Isn’t there any way of putting yourself back together?” Ron asked.

“Yes,” said Hermione with a hollow smile, “but it would be excruciatingly painful.”

“Why? How do you do it?” asked Harry.

“Remorse,” said Hermione. “You’ve got to really feel what you’ve done. There’s a footnote. Apparently the pain of it can destroy you. I can’t see Voldemort attempting it somehow, can you?”

“No,” said Ron, before Harry could answer. “So does it say how to destroy Horcruxes in that book?”

“Yes,” said Hermione, now turning the fragile pages as if examining rotting entrails, “because it warns Dark wizards how strong they have to make the enchantments on them. From all that I’ve read, what Harry did to Riddle’s diary was one of the few really foolproof ways of destroying a Horcrux.”

“What, stabbing it with a basilisk fang?” asked Harry.

“Oh well, lucky we’ve got such a large supply of basilisk fangs, then,” said Ron. “I was wondering what we were going to do with them.”

“It doesn’t have to be a basilisk fang,” said Hermione patiently. “It has to be something so destructive that the Horcrux can’t repair itself. Basilisk venom only has one antidote, and it’s incredibly rare—”

“—phoenix tears,” said Harry, nodding.

“Exactly,” said Hermione. “Our problem is that there are very few substances as destructive as basilisk venom, and they’re all dangerous to carry around with you. That’s a problem we’re going to have to solve, though, because ripping, smashing, or crushing a Horcrux won’t do the trick. You’ve got to put it beyond magical repair.”

“But even if we wreck the thing it lives in,” said Ron, “why can’t the bit of soul in it just go and live in something else?”

“Because a Horcrux is the complete opposite of a human being.”

Seeing that Harry and Ron looked thoroughly confused, Hermione hurried on. “Look, if I picked up a sword right now, Ron, and ran you through with it, I wouldn’t damage your soul at all.”

“Which would be a real comfort to me, I’m sure,” said Ron. Harry laughed.

“It should be, actually! But my point is that whatever happens to your body, your soul will survive, untouched,” said Hermione. “But it’s the other way round with a Horcrux. The fragment of soul inside it depends on its container, its enchanted body, for survival. It can’t exist without it.”

“That diary sort of died when I stabbed it,” said Harry, remembering ink pouring like blood from the punctured pages, and the screams of the piece of Voldemort’s soul as it vanished.

“And once the diary was properly destroyed, the bit of soul trapped in it could no longer exist. Ginny tried to get rid of the diary before you did, flushing it away, but obviously it came back good as new.”

“Hang on,” said Ron, frowning. “The bit of soul in that diary was possessing Ginny, wasn’t it? How does that work, then?”

“While the magical container is still intact, the bit of soul inside it can flit in and out of someone if they get too close to the object. I don’t mean holding it for too long, it’s nothing to do with touching it,” she added before Ron could speak. “I mean close emotionally. Ginny poured her heart out into that diary, she made herself incredibly vulnerable. You’re in trouble if you get too fond of or dependent on the Horcrux.”

“I wonder how Dumbledore destroyed the ring?” said Harry. “Why didn’t I ask him? I never really…”

His voice trailed away: He was thinking of all the things he should have asked Dumbledore, and of how, since the headmaster had died, it seemed to Harry that he had wasted so many opportunities when Dumbledore had been alive, to find out more… to find out everything…

The silence was shattered as the bedroom door flew open with a wall-shaking crash. Hermione shrieked and dropped Secrets of the Darkest Art; Crookshanks streaked under the bed, hissing indignantly; Ron jumped off the bed, skidded on a discarded Chocolate Frog wrapper, and smacked his head on the opposite wall; and Harry instinctively dived for his wand before realizing that he was looking up at Mrs. Weasley, whose hair was disheveled and whose face was contorted with rage.

“I’m so sorry to break up this cozy little gathering,” she said, her voice trembling. “I’m sure you all need your rest… but there are wedding presents stacked in my room that need sorting out and I was under the impression that you had agreed to help.”