Isabella Brown had lived long enough to know that the world rarely offered explanations.
It offered facts. Evidence. Symptoms and outcomes and the occasional pattern, if you were patient enough and lived long enough to see it emerge. But explanations - true ones, the kind that accounted for every variable and left no remainder - those were rarer than most people admitted, and the ones who claimed otherwise were usually selling something.
She had learned this lesson slowly, over a very long time.
She set the last of the vials in its rack and stepped back from the workbench, removing her glasses and cleaning them with the hem of her robe - a habit so old it had stopped being conscious decades ago. The cottage was quiet. From the room across the hall, she could hear the low, even rhythm of Eddie's breathing. Still asleep. Good. He needed it more than he knew, which was saying something, because he knew he needed it considerably.
She put her glasses back on and looked at the workbench without seeing it.
Ninety-one years as a healer.
Not ninety-one years alive - she had a few more than that, though she had long since stopped counting with any precision, and certainly stopped mentioning it. Age, in her experience, did two things to a person's credibility: below a certain number it made people underestimate you, and above a certain number it made them uncomfortable. Neither was useful. So, she had settled, some decades ago, into a comfortable vagueness on the subject and left it there.
But ninety-one years of practice. Ninety-one years of patients, of injuries, of illnesses both mundane and extraordinary. She had treated Cursed wounds that ate through flesh like acid. She had reversed partial Transfigurations gone wrong. She had sat with people in the last hours of magical exhaustion so severe their cores had simply burned themselves out, and she had done what could be done and accepted what couldn't. She had seen magical cores in every condition imaginable - dormant, damaged, overdeveloped, stunted, split by Dark magic, expanded by ritual, reduced to embers by age or grief or sustained abuse.
She had never seen one like Eddie's.
Isabella moved to the chair by the fire and sat down with the deliberateness of someone who has decided to think properly and understands that thinking properly requires stillness. She folded her hands in her lap. Let the fire be the only moving thing in the room for a moment.
Begin at the beginning, she told herself. That was always the method. Begin at the beginning and follow it forward.
He had arrived on All Hallows' Eve. That was the first fact. The date mattered - All Hallows' Eve was one of the thinning nights, when the boundaries between what was and what lay beyond grew permeable in ways that resisted precise measurement. The Department of Mysteries had catalogued dozens of anomalous incidents over the centuries that clustered around the same handful of dates - Hallowe'en, Beltane, the solstices. Nights when something in the fabric of things loosened slightly and allowed events that ought to have been impossible to slip through the gap.
That accounted, perhaps, for the arrival itself.
She turned to his condition. When she had found him, he had been - she searched for the clinical word and found it insufficient - devastated. Not merely injured. Devastated at a level that went below flesh and bone, below the ordinary registers of trauma that ninety-one years of practice had given her a reliable sense for. His magical core had been present but strange - present in the way that a fire is present when you can see the heat haze without seeing the flame. There but occluded. Buried under something she didn't have the vocabulary for.
She had treated him as she would treat any patient in magical shock. Wiggenweld for basic physical restoration. Stabilization charms. Time. The Strengthening Solution when he was coherent enough to take it. Standard procedure, executed carefully.
And it had worked, which she now realized was itself strange. Because what had been done to him - whatever Knull was, whatever had happened in whatever time and place he had come from - should not have been addressable by standard procedure. She had assumed her own competence was responsible for his recovery. She was, in fact, extremely competent, and had not been in the habit of false modesty about it for approximately sixty years.
But now she wondered.
Perhaps he had been recovering himself, all along, and she had simply been present while it happened.
She unfolded her hands, refolded them. Moved on.
His core now. That was the part that resisted every framework she tried to fit around it.
A Muggle-born witch or wizard of exceptional power - and she had treated several in her career, including two of the most naturally gifted she had ever encountered - typically presented a core in the upper range of what she would call moderate development at his apparent age. Strong, certainly. Promising. The kind of core that seven years of good training would develop into something remarkable. She had a reliable instinct for these things, built over decades, and she trusted it.
Eddie's core was not in the upper range of moderate development.
Eddie's core was, by any clinical measure she possessed, fully mature and operating at a level that she associated with practitioners of forty- or fifty-years' experience - people who had spent careers pushing and developing and refining. And unlike those practitioners, his showed no signs of the particular shape that training gave a core - the structured, disciplined quality of something that had been deliberately developed. It was vast and unstructured and strange, like a river that had never been given banks.
And it had grown after the Cruciatus.
This was the part she kept returning to, because it was the part that most thoroughly defeated her.
She knew, theoretically, that extreme trauma could catalyze core development. There were documented cases - rare, poorly understood, the subject of several restricted studies she had read in her capacity as a senior healer. The theory was that the core, under sufficient duress, could respond by expanding, as a kind of defensive reaction. Generating more of what it needed to survive.
But the documented cases involved growth of perhaps ten or fifteen percent. Measurable, notable, clinically significant.
The change in Eddie's core was not ten or fifteen percent.
She had run the resonance indicator three times, in the private hours of the night while he slept, because she had not trusted the first result and had not entirely trusted the second. The third had confirmed it. Whatever the Cruciatus had done to him - and it had done damage, she was not minimizing that - it had also done something to his core that she could not explain and had no precedent for.
She made a mental note to consult her library. Then made a second note reminding herself that her library, extensive as it was, had not yet answered a single question about this boy to her satisfaction, and she should perhaps adjust her expectations accordingly.
Isabella exhaled slowly.
Begin at the beginning, she had told herself. She had followed it forward. And where had it brought her?
To a set of facts that she could observe and document and could not explain. To a boy from fifty-one years in the future who carried something inside him that she didn't have a name for and a magical core that should not exist in the condition it was in. To questions that her ninety-one years of practice and however many years of life had not equipped her to answer.
She was, she admitted to herself, in entirely new territory.
The fire shifted. A log settled lower, sending a brief upward curl of sparks that faded before they reached the chimney.
Isabella watched them go.
And then, because she was who she was and had always been, her mind moved - as it inevitably did - from what she couldn't explain to what she could actually do about it. Sitting with uncertainty was a skill she had developed out of necessity. Sitting still while there were practical problems within reach was not a skill she had ever managed to acquire, and she had largely stopped trying.
Eddie would heal. She was confident of that now in a way she hadn't been in the first week. His body was resilient in ways that she was fairly sure had something to do with the presence inside him rather than any natural human recovery rate, but the outcome was the same regardless of the mechanism. He would heal.
And then what?
The question had been sitting at the edge of her thinking since almost the beginning, and she had been - she acknowledged this with some self-reproach - deliberately not looking directly at it. There was enough to manage in the immediate. Immediate problems were tractable. Future problems had a way of changing shape before you reached them.
But the future problem was becoming a present problem, and it deserved a direct look.
He could not stay in the cottage indefinitely. She had brought him here out of instinct and necessity, and she did not regret it, and she would not withdraw the shelter she had offered. But a boy who appeared to be a teenager, who had no documents, no family, no history in this time - he would need something. Some shape of a life that could hold him until whatever happened next.
She was still turning that over when the other thought came.
They would come back.
She had known it since the moment she returned to find Macnair's wand on the floor and the particular quality of silence that meant something had been resolved in a room she hadn't been present for. She had chosen not to say it aloud - not yet, not while Eddie was still fragile, not while there was nothing practical to be done about it immediately. But knowing and not saying were different things from not knowing, and Isabella had never had much patience for pretending.
Abraxas Malfoy had left in a panic. That was the variable that concerned her most. Not his anger - she had accounted for his anger, had been accounting for it since long before this incident, since the first time she had understood what kind of man he was and what kind of cause he had quietly attached himself to. Anger she could predict. Anger followed patterns.
Panic was different.
A panicking man told stories. A panicking man went back to whoever he reported to and said something had gone wrong, and the response to something going wrong, in the circles Abraxas Malfoy moved in, was not to accept the loss and move on. It was to escalate.
And escalation, in those circles, had a direction.
She did not say the name, even in the privacy of her own thoughts. She had not said it aloud in years. There were people - she knew this, had heard it from sources she trusted - who believed the name itself carried a resonance. An attentiveness. That saying it was a small act of summoning, and that enough small acts accumulated into something that couldn't be taken back.
She didn't know if she believed that.
She knew she wasn't willing to test it alone in a cottage in Sheffield at whatever hour of the night this was.
The Pure-bloods - the ones who called themselves that as though the word were a title rather than a description, as though it meant something about worth and destiny rather than simply an accident of parentage - had been quiet, mostly. Public-facing quiet, the kind that had a great deal of noise behind it if you knew where to listen. She had been listening for a long time. Long enough to remember when their kind of thinking had been fringed and embarrassing rather than organized and dangerous. Long enough to have watched it grow.
They hadn't moved openly yet. That was the one comfort, and it was a limited one.
Macnair disappearing without explanation would not go unnoticed. Macnair disappearing from a Mudblood healer's cottage in Sheffield, without his wand, with his companion returning alone in a state of evident alarm - that would generate questions. And questions, in the current climate, generated attention.
She looked toward the hallway. The quiet breathing from Eddie's room continued, steady and even, entirely unaware.
She thought about what he carried. The core that shouldn't exist. The presence inside him that had done something to Macnair she didn't have the full picture of and wasn't entirely sure she wanted. The knowledge of fifty-one years of a future she couldn't access and he couldn't fully share.
She thought about what it would mean if the wrong people came looking and found him here.
Isabella Brown had lived long enough to know that the universe rarely offered explanations.
But it offered, fairly reliably, a choice between acting and not acting. Between preparing and hoping.
She reached for her wand.
There were wards to reinforce. There were people she needed to quietly contact - people she trusted, which was a short list, and had been getting shorter for some years now, which was itself a warning she had been trying not to read too carefully.
She would read it now.
Eddie needed time to heal. She was going to make sure he had it.
Whatever that required.