Deep winter arrived without announcing itself, the way the serious cold always did — not as a single event but as an accumulation, the temperature dropping another degree and then another until one morning Theron woke to find the water skin beside his bedroll had a thin crust of ice across the top, and he understood that the cold he'd been managing until now had been the warm-up.

  The camp adapted. Fires burned longer, built higher. People moved between their tents and the main fire in the quick decisive way of those conserving warmth, no lingering in open air. Children were kept closer. The hunters went out in shorter rotations, came back faster. Everything that could be done near a fire was done near a fire.

  The healing spot got a second layer of hides across the overhang's open face, which Dorn installed one morning without being asked, working with the brisk efficiency of a man completing a task he'd decided on during the previous night's cold. It blocked some of the light but kept more of the heat, and Theron accepted the trade without discussion because there was nothing to discuss — Dorn was right.

  The injuries changed with the season.

  Summer brought cuts and sprains and the occasional animal encounter. Autumn brought the harvest work — overextended backs, crushed fingers, one memorable dislocated shoulder from a man who'd been more confident than careful about the height he was working at. But winter had its own specific vocabulary: cold damage, falls on ice, the accumulated strain of bodies working harder just to stay warm.

  The first frostnip case came three days into the deep cold — a boy of about eight who'd been outside longer than his hands should have allowed, brought in by his mother with fingers that had gone from white to red and were now somewhere between both, the skin still soft beneath his touch, which was the thing that mattered.

  Not frostbite. Not yet.

  "Cold water?" Sora asked, already reaching.

  "Warm. Not hot." He held up a hand — wait, watch — and showed her the temperature he wanted, testing it against his own wrist the way he'd have tested formula for a baby. Not the hot water instinct, which was what everyone reached for and which would cause more damage than it solved. Warm. Patient. Let the tissue come back slowly.

  He had her manage the temperature while he talked the boy through it. The rewarming hurt — it always hurt, the nerves waking back up — and the boy was at the age where admitting it hurt was a complicated social proposition, so he held very still and breathed through his nose and let a single tear run down his left cheek that he did not acknowledge. Theron pretended not to see it. The mother stood at the healing spot's edge with her arms folded and her jaw set in the way of mothers who had decided to be calm and were managing it on willpower.

  Twenty minutes later the color was returning correctly and the boy could move his fingers again. He examined them with the expression of someone who had been through something and was now inspecting the evidence.

  "Keep them warm," Theron said, in the tribe's language. He mimed the wrapping he wanted, then pointed at the extra hide strips Sora had already set out. "Don't let them get cold again. Not today."

  The boy nodded with great seriousness. Then his mother took his hand and walked him home, and Sora made a note in her herb book under the heading she'd titled, in her own marks, cold injury.

  He hadn't told her to make that section. She'd made it herself after the first frost two weeks ago, apparently on the theory that if winter was coming then cold injuries were a category that required its own page.

  He really needed to start paying her.

  The broken wrist came from the river path — a woman named Osa who'd been fetching water and stepped on a patch of ice that was thinner than it looked. She came in cradling her right arm against her chest with the careful stillness of someone who had assessed the situation and decided that moving it was not an option she was currently exercising.

  Theron examined it, confirmed the break by feel and by the specific quality of her pain response when he palpated — and by the visible angulation that was hard to miss — and started the splinting with the method he'd refined over the past months. Two straight pieces of wood, the right padding, binding tight enough to immobilize without cutting circulation.

  Sora assisted with the fluid efficiency they'd developed together over dozens of procedures, anticipating each step half a beat ahead. He didn't need to ask for things anymore, with her — she read the procedure the way she read herb sequences, by the logic of what came next. It had happened gradually and he'd only noticed it one day when he'd reached for something and it was already there, and he'd looked up and she'd already moved on to the next preparation.

  Osa watched all of this with the focused attention of someone who had made a decision to be interested rather than frightened, which Theron appreciated. Some people went very still and inward during treatment. Others watched. He'd always preferred the ones who watched — they asked better questions afterward.

  "How long?" she asked, when the splint was set and she was testing the weight of her arm in the sling.

  "Six weeks, maybe eight." He held up fingers. Her face did something brief and precise — the calculation of a person figuring out what six weeks meant for her specific winter work. Then she nodded. Accepted it. Started adapting.

  He liked the Ash Tooth people. They were pragmatic in a way that still caught him off guard sometimes.

  He noticed Mora's absence on the fourth day of the deep cold.

  He'd been aware of the gap at the main fire — she was usually there in the mornings, one of the fixed points of the camp's early hours, cross-legged near the heat with her clay cup and her apprentice nearby — but it had taken him longer than it should have to register it properly. The camp was compressed and close and everyone was moving differently; it had been easy to explain her away.

  That morning he went to her tent.

  She was inside, which told him something. Mora didn't stay inside in the mornings. She was sitting near her small fire with a hide around her shoulders and her cup in her hands and she looked, when he ducked under the entrance, like a woman who had decided to be annoyed by his visit before he'd had a chance to make it.

  "Good morning," he said, in the tribe's language.

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  She looked at him with the sharp eyes that the cold had not touched. Everything else had been touched — she was moving slowly, the kind of careful that happened when joints hurt, and the fire was built higher than her usual careful conservation suggested she'd have chosen, and she had an extra hide on that she hadn't had in autumn. But the eyes were the same.

  She said something that Theron caught most of: I didn't ask you to come.

  "No," he said. He stayed where he was, near the entrance, not advancing. "I came because I wanted to. I can leave."

  She looked at him. Then, slowly, she made the gesture that meant sit down, then. Not warmly. As if she were granting a minor concession to someone who would be difficult about it otherwise.

  He sat.

  He checked her joints — she permitted this with the expression of someone enduring a necessary indignity — and confirmed what he'd expected: the cold was getting into the places where the body carried its years. Her hands were worse than her knees. The right side worse than the left. She'd been managing it alone, which was what he'd expected, and she'd been managing it for longer than four days, which was also what he'd expected.

  He went back to the healing spot and returned with a warmed stone wrapped in hide for the hands — heat therapy, simple, the thing that worked before anything more sophisticated — the feverbark paste he'd been cautiously applying to inflamed joints since late autumn, and the warmest hide he had that wasn't currently assigned to the overhang.

  She accepted all of it without saying thank you, which from Mora was approximately equivalent to a speech.

  He visited every morning after that. She never asked him to come and she never told him not to.

  The coughs were the constant background of the season — nothing dramatic, nothing like Essa's pneumonia, but the steady low-level respiratory complaints that winter always generated. He treated them with what he had: steam for the congestion, feverbark tea for the inflammation, the same quiet rotation of small treatments he'd been running since the cold arrived. Not honey — the world here didn't run to convenient beehives — but feverbark brewed light and drunk warm served well enough, and the steam did the rest.

  Sora managed most of the minor cough cases herself now. He would hear her on the other side of the overhang, asking the right questions — how long, wet or dry, sleeping or not — and making the right calls. When she was uncertain she came to him. When she was certain she didn't, and her certainty was usually correct.

  Kael had been trusted with the steam setup when both of them were occupied. He was quieter than Sora about learning — he didn't ask the same volume of questions, didn't keep written notes — but Theron had noticed that he never needed to be told the same thing twice, which was its own kind of intelligence.

  One evening after the cough cases had settled and Kael had gone home, Sora looked at her notes for a moment and then at Theron with the expression that meant she'd been working toward a question.

  "When I know enough," she said. Carefully — she was precise about the edges of what she knew. "Can I treat alone? Without you nearby?"

  He thought about it. "What does 'alone' mean to you?"

  She gave it the same weight. "Camp cases. Minor. You in the camp but not here."

  "For minor cases," he said. "Yes. You're already doing it."

  She looked at her notes again. Not pleased, exactly — it was more like she was filing the confirmation in the right place. "When is a case not minor?"

  "When you're not sure," he said. "If you're asking whether it's minor, it isn't."

  She wrote that down. He watched her do it and felt something that wasn't quite pride and wasn't quite relief but had elements of both.

  The night Dorn told him about his father, it was late.

  The camp had gone quiet in the layered way of deep winter nights, the fires banked down, the cold pressing in around the edges of the overhang where the hides didn't quite meet. Theron had been working through his notebook by firelight — the writing system that was slowly becoming something more organized than personal code — and Dorn had been there for the better part of two hours, nominally resting, actually watching the fire with the look of a man thinking through something.

  It wasn't unusual. Dorn spent time at the healing spot the way water found its level — it was simply where he went. Theron had long since stopped finding reasons for it and started accepting it as a feature of his life, like the cold and the tea.

  After a while Dorn said: "My father taught me to read snow."

  Theron looked up. Dorn wasn't looking at him — he was looking at the fire, in the way of someone speaking out loud rather than to a specific person.

  "Tracks in snow," Dorn said. "How long ago. How fast. How heavy. What animal doing." He paused. "Patient, my father. I asked many questions. He answered. All of them."

  Theron set his notebook down.

  "I was maybe ten," Dorn said. He thought about it. "Ten. Eleven. One winter." A pause. "He made it—" he searched for the word, or maybe for something beyond the word. "Simple. Like it is obvious. Like anyone can see, if they look right." A small shake of his head. "Not everyone sees. I know this now. But he made it feel — easy."

  The fire crackled. Outside, the camp was silent.

  "His leg broke two winters later," Dorn said. "Bad break. Before you. Before anyone who could help." He said this without accusation — it was just the shape of how things had been. "Healed wrong. He walked, but—" the gesture he made was complicated, a slight tilting, not quite right. "Still hunted. He wanted to hunt. But slower."

  Theron didn't say anything. There was nothing to say that wouldn't have been the wrong shape for the moment.

  "Two winters after the leg," Dorn said. "Something took him fast. Not the leg — something else. Here." He touched his chest, his side. "Three days. Then gone." He was quiet for a moment. "I was fourteen, maybe. Fifteen." He picked up a stick and turned it in his hands without doing anything with it. "Fast is better. I think now — fast is better. I did not think so then."

  The fire shifted, settled. The cold outside pressed against the hides and the hides held.

  "He taught you well," Theron said, after a while.

  Dorn looked at him. Then he nodded once, slowly. "Yes."

  That was all. Neither of them said anything else for a while, and the silence had the particular quality of one that had been earned rather than arrived at.

  After a long time, Dorn set the stick down and stretched out on his side near the fire with the easy practicality of a man who had decided this was where he was sleeping. "You write in the dark," he said, glancing at the notebook. "Your marks. Your eyes are bad?"

  "My eyes are fine."

  "Hm." He settled. "Strange marks."

  "They say things. Like a memory that doesn't forget."

  Dorn was quiet for a moment, considering this. "A memory that doesn't forget," he repeated, and Theron couldn't tell whether he thought that was a good thing or an unsettling one. Probably both.

  Within a few minutes his breathing had evened into sleep, the way Dorn fell asleep — fully and without argument, everything committed.

  Theron sat with the notebook and the low fire and the knowledge of what Dorn had just given him, which was not information exactly, and not exactly comfort, but something in the territory between the two. The kind of thing you offered another person late at night when there was no reason not to.

  He sat with it for a while before he went to sleep.

  Mora came to the healing spot on a night near the end of the month.

  She came without her apprentice, without her usual careful schedule, just walked in from the cold with her clay cup and her extra hide and sat down at the fire with the air of someone who had decided to do a thing and was doing it. Dorn was already there, and Sora, and the four of them sat together in the warmth with the camp pressing cold outside and the fire holding its own.

  Nobody talked much. There wasn't a particular need to.

  Mora drank her tea. Dorn ate something. Sora had her notes open but wasn't reading them, just holding the book the way people held things they found reassuring. Theron looked at the fire and felt the warmth on his face and thought about nothing specific, which was its own form of rest.

  At some point Mora said something to Sora — quiet, in their language, the kind of thing you said to someone sitting next to you. Sora listened and responded. Mora made a small sound that might have been agreement or might have been approval; with Mora the two were often the same.

  Dorn caught Theron's eye across the fire and made a small gesture — this is good, yes? — and Theron nodded without making anything of it, because it was good and making something of it would have ruined it.

  The cold pressed in. The fire held. The four of them sat in it together, and none of them needed to name what it was to know what it was.