Dumbledore was certain.
He had been building toward certainty for some time, but seeing the locket — feeling what was inside it, watching Kevin recognize it with the same immediate understanding he'd shown toward the diary in the Chamber of Secrets — pushed him over the threshold.
Tom Riddle had made Horcruxes. More than one. Probably several. And Kevin Croft had now stumbled into two of them with an accuracy that went considerably beyond luck.
He stood in the corner of the sitting room while the others dealt with Kreacher's account and let himself follow the pattern.
First year. Kevin had confronted Quirrell — Voldemort's host — with a directness that suggested he knew ordinary spells would not finish the threat. He had also, deliberately and with no apparent reason, ensured Harry touched Quirrell too. As if he understood that the blood protection Harry carried needed to be tested in a specific way.
Second year. The basilisk. Kevin had predicted the creature's behavior with unnerving precision. Then, immediately after the fight — before anyone had thought to suggest it — he had driven a basilisk fang through the diary. Not a curse. Not a spell. A fang. The one material that could actually destroy a Horcrux. He had known.
Third year. Kevin had never treated Sirius Black as a threat, not even when every other student in the castle believed him to be a murderous servant of Voldemort. He had steered Harry gently toward the truth, as if he'd already known what the truth was.
Fourth year. He had identified the fake Moody. And then in the graveyard, he had allowed Voldemort's resurrection because he understood — understood in ways Dumbledore himself had taken decades of careful research to approach — why the blood transfer mattered. Why the resurrection on those exact terms was survivable for Harry where other versions might not be.
And now: a Horcrux, in a pile of junk, found in minutes.
Dumbledore looked at Kevin.
Kevin was looking at the space where the locket had been, his expression distant. Working something through.
I let him get to fifth year without telling him about the Horcruxes, Dumbledore thought. He's been finding them on his own.
The question of what Kevin actually knew — and how — was one Dumbledore had circled for four years. He was no closer to an answer. But the evidence had long since crossed the threshold from remarkable to inexplicable, and Dumbledore had spent enough of his long life with inexplicable things to know when to stop demanding explanations and start making use of what he had.
Kevin was good. That had been obvious from the first week of term in Year One. Kevin was loyal. Four years of consistent behavior, increasingly high stakes, and not one action that had served any interest except his friends' survival and Voldemort's defeat. Whatever Kevin knew that he wasn't saying, he was using it well.
The real question was not what does Kevin know but what is Kevin still not telling me that I need.
The basilisk. The fangs. Kevin had used one, then left the Chamber of Secrets and never mentioned them again.
Dumbledore turned this over.
He would need to visit the Chamber. Soon. Before term started, if possible. And he would need to find a reason to put more pressure on Kevin — not hostile pressure, but the kind that productive people applied to useful things to see what else came out.
Snape had always understood this instinctively. Which was probably why Snape found Kevin simultaneously fascinating and maddening.
Dumbledore allowed himself a small, private smile and began composing a list of tasks he intended to assign Kevin when term resumed.
Kevin, across the room, had no idea Dumbledore was watching him. He was too busy dealing with a problem of his own.
He knew the basilisk fang had destroyed the diary. He'd driven it straight through the cover and watched the Horcrux come apart. At the time, he hadn't been thinking about Horcrux mechanics — he'd been in the Chamber of Secrets with a sword-wielding memory of Tom Riddle and a dying Harry Potter, and he'd used the nearest weapon. But afterwards, once he'd understood what the diary was, the connection had been obvious.
Basilisk venom. It could destroy Horcruxes.
And he had walked out of the Chamber, left the dead basilisk where it lay, and never gone back.
There were fangs in that corpse. How many Horcruxes still needed destroying? The ring, the locket, the diary — destroyed already — that left the diadem, the cup, Nagini, Harry. Four remaining.
Four targets that apparently needed either basilisk venom, Fiendfyre, or a non-lethal soul attack that Kevin hadn't finished developing yet.
He did not currently have access to any basilisk venom.
The Chamber of Secrets was presumably still sealed and the corpse still there, unless the castle had done something unusual with it over the last three years. But getting down there required Parseltongue, which Harry had and Kevin very much did not.
He filed it. A problem he needed to solve, probably with Harry's help, and soon.
"Kevin."
He looked up. Dumbledore was watching him with an expression Kevin couldn't entirely read.
"Something on your mind, Headmaster?"
Dumbledore shook his head pleasantly. "Just thinking. Thank you for this." He touched the pocket where he'd placed the locket. "Scour the rest of the house, would you? You and Harry both. Look for anything that seems resistant to spells, resistant to physical force, or simply wrong in a way you can't explain."
Kevin nodded.
Dumbledore made his goodbyes and Disapparated.
The room felt slightly different without him in it.
Sirius had not yet come back down. They could hear him, distantly, on one of the upper floors. Moving slowly. No voices.
Harry looked at Kevin. "What was that locket?"
"The same kind of thing as Tom Riddle's diary," Kevin said. "A piece of Voldemort's soul. Anchoring him. Keeping him killable only in specific ways." He kept his voice level. "Dumbledore's been researching it. He'll explain properly at the start of term."
Harry and Ron absorbed this. The room went quiet again, just the evening sounds of the old house settling.
"Kevin," Ron said eventually. "Your page turns are going to keep me up tonight, aren't they."
Kevin looked at the alchemy textbook he'd produced from somewhere during the silence, already two chapters ahead of where he'd started.
He thought about his university days in his previous life — the nights he'd gamed while his roommate crammed, the noise and the resentment, the specific misery of trying to sleep through someone else's activities.
He shut the book. Firmly.
"You're right," he said, with genuine conviction. He tossed the book aside, pulled the blanket up, and put out his light. "Goodnight."
He was asleep in approximately ten seconds.
Ron and Harry stared at the ceiling in the dark.
"...What just happened?" Ron whispered.
Harry had no answer.
---
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