“They can help,” He dropped his voice and said, so that none of them could hear but Hermione, who stood between them, “We don’t know where it is. We’ve got to find it fast. We don’t have to tell them it’s a Horcrux.”
Harry looked from Ron to Hermione, who murmured, “I think Ron’s right. We don’t even know what we’re looking for, we need them.” And when Harry looked unconvinced, “You don’t have to do everything alone, Harry.”
Harry thought fast, his scar still prickling, his head threatening to split again. Dumbledore had warned him against telling anyone but Ron and Hermione about the Horcruxes. Secrets and lies, that’s how we grew up, and Albus… he was a natural… Was he turning into Dumbledore, keeping his secrets clutched to his chest, afraid to trust? But Dumbledore had trusted Snape, and where had that led? To murder at the top of the highest tower…
“All right,” he said quietly to the other two. “Okay,” he called to the room at large, and all noise ceased: Fred and George, who had been cracking jokes for the benefit of those nearest, fell silent, and all of the looked alert, excited.
“There’s something we need to find,” Harry said. “Something—something that’ll help us overthrow You-Know-Who. It’s here at Hogwarts, but we don’t know where. It might have belonged to Ravenclaw. Has anyone heard of an object like that? Has anyone come across something with her eagle on it, for instance?”
He looked hopefully toward the little group of Ravenclaws, to Padma, Michael, Terry, and Cho, but it was Luna who answered, perched on the arm of Ginny’s chair.
“Well, there’s her lost diadem. I told you about it, remember, Harry? The lost diadem of Ravenclaw? Daddy’s trying to duplicate it.”
“Yeah, but the lost diadem,” said Michael Corner, rolling his eyes, “is lost, Luna. That’s sort of the point.”
“When was it lost?” asked Harry.
“Centuries ago, they say,” said Cho, and Harry’s heart sank. “Professor Flitwick says the diadem vanished with Ravenclaw herself. People have looked, but,” she appealed to her fellow Ravenclaws. “Nobody’s ever found a trace of it, have them?”
They all shook their heads.
“Sorry, but what is a diadem?” asked Ron.
“It’s a kind of crown,” said Terry Boot. “Ravenclaw’s was supposed to have magical properties, enhance the wisdom of the wearer.”