The first thing Elara Veyne learned on a battlefield was that mud had a smell.

Not the clean smell of rain-wet earth. This was older and fouler: iron, bile, trampled grass, and the sweet rot of horses that had died hours ago and would be dying for hours more. She had stopped noticing it sometime in her second year. Tonight it clung to the back of her throat like a bad memory.

"Tourniquet," she said, not looking up. "Tighter. I want to see his fingers go white."

The boy beside her pulled the strap until the soldier on the stretcher screamed through his teeth. Elara counted three breaths, watched the bleeding from his thigh slow to a seep, and pressed two fingers against the wound. Warmth gathered under her skin, the quiet pulse she had been trained to call the weave, and she felt the torn vessel knit itself shut, thread by thread.

"Next," she said.

The field hospital stood in a trampled barley field south of the river Ness, a sprawl of canvas and lantern light that rose and fell with the wind. Three hundred and twelve wounded lay in rows. Eleven healers worked among them. Elara had stopped counting how many she had treated after the fortieth, when her hands began to shake.

Don't think about the number. Think about the next one.

"Healer Veyne."

She looked up. Commander Brannock stood at the end of the row, mud to his knees, his grey cloak stiff with someone else's blood. He had the flat, tired face of a man who had already decided how the night would end.

"The Fourth is falling back to the east ridge," he said. "We hold until dawn, and then we withdraw. Prepare the walking wounded to move."

"And the others?"

He did not answer. He didn't have to. Elara had seen enough retreats to know what they left behind.

"I'll do what I can," she said.

"You'll do what's possible." His eyes shifted past her shoulder. "Which brings me to the prisoner."

She had been avoiding that corner of the field for an hour.

They had brought him in at dusk, one of the enemy's skirmishers, dragged from a ditch by two privates who clearly hadn't decided whether to save him or finish him. Now he lay on a stretcher at the edge of the lantern light, apart from the others, with a guard standing over him whose spear point never quite left the man's chest.

Elara walked over. Brannock followed.

The soldier was young, perhaps her own age or a little less, with sharp cheekbones and dark hair matted flat against his forehead with sweat. His coat was the blue-grey of the enemy line, torn open from collarbone to hip. Beneath it, someone had packed the wound with wadded cloth, and the cloth was black and soaked through.

She knelt and peeled it back.

The air left her lungs.

A lance, or something like it, had gone in below the ribs and angled upward. She could see the shape of what it had done without touching him: the liver torn open, the diaphragm punctured, the lung beyond it filling slowly with blood. His lips had gone the grey-blue of old slate. Every breath came with a wet, rattling hitch.

"How long?" she asked the nearest private.

"Found him mid-afternoon, ma'am. He's been like that since."

Six hours. He should have been dead five hours ago.

His eyes were open. They were a pale, clear grey, and they found hers without difficulty, which was somehow worse.

"Healer," he said. His voice was a ruined whisper. He spoke the common tongue with only the faintest accent. "Don't."

"Don't what?"

"Waste... your strength."

Elara almost laughed. It came out as a breath. "That's generous of you."

She laid her palm flat against his chest, below the wound, and reached for the weave.

It was like pressing her hand against a door that had no hinges. The damage was too deep, too wide. She could knit a torn vessel or close a clean cut, but this was a dozen ruptures bleeding into each other, and every thread she tied unraveled before the next was set. She tried twice more. The third time, her own pulse stuttered with the effort, and she pulled back.

"Well?" said Brannock.

She did not answer immediately. Her hands had gone cold.

"With a full surgical ward and three healers working together, I would give him one chance in five," she said. "Here, with what I have..."

"Then there's your answer."

"I haven't given it yet."

"Healer." Brannock's voice stayed level. That was the dangerous thing about him. He never raised it. "I have three hundred of our own men in this field, and thirty of them might survive the night if you reach them. You have been on your feet for nineteen hours. Every minute you spend on an enemy soldier is a minute someone from our side bleeds out."

"I know that."

"Then you also know what I'm ordering." He looked at the guard, then back at her. "Let him go. Make him comfortable if it helps your conscience. But you will not treat him."

The words sat in the lantern light between them.

Elara looked at the soldier. His breathing had grown shallower. Pink froth had gathered at the corner of his mouth, and a small, absurd detail snagged her attention: a cord around his neck, half hidden by the ruined coat, with something small and dark hanging at the end of it. A pendant or a token. It rested against his collarbone, and where it touched his skin, the grey flesh looked faintly flushed, as if the thing were warm.

Someone gave him that, she thought. Someone is waiting for him to come home.

That was the thought she should not have had. It was the thought that had ended better healers than her.

"Your orders are noted, Commander," she said.

"They are not suggestions."

"I understand that."

He studied her for another few seconds, then nodded once and turned away. She heard his boots in the mud, then the low bark of his voice sending runners toward the east ridge. The guard remained, spear point steady, eyes carefully elsewhere.

Elara stayed on her knees.

She knew the rule. Every healer in the kingdom knew it, the way a sailor knew not to trust a calm sea. A battlefield healer's first duty was triage. You did not spend your strength on the one who could not be saved. You moved on, and you carried it with you, and you learned to sleep anyway.

She had followed that rule for five years. She had followed it when a boy of sixteen had begged her to stay with him, when a sergeant she liked had died with her hand on his chest, when a woman from a farming village had asked her to say it would be all right. She had said the words, and walked on, and gone on walking until the numbness took over.

And every time, the same thought had followed her into her sleep.

If I had been better, he would have lived.

She knew it was not true. Her instructors had told her it was not true. Healers who knew more than she did had said it was not true. But belief did not answer to reason, and somewhere in the last five years she had stopped arguing with it.

The soldier's chest rose. Fell. Rose again, more slowly.

Behind her, the camp had become a low roar of voices, hooves, and the grind of wagon wheels. Somewhere beyond the lanterns, on the dark slope of the western ridge, a single rider sat motionless against the stars. A scout, she supposed. Ours or theirs, she couldn't tell, and it didn't matter.

"You are going to do something foolish," the soldier whispered.

"Don't talk."

"I can see it." His mouth twitched. It might have been a smile. "I know that look."

"You don't know anything about me."

"No." His eyes slid shut, then opened again with visible effort. "But I know... what I would be... if I let it go."

Elara stared at him.

She thought of the spell.

She had never cast it. She had read about it once, in the locked section of the academy library, in a book whose pages were so brittle they cracked when she turned them. The Transference. A single paragraph, and a warning underlined twice in a different hand: No living healer has survived its misuse. The technique was simple, in the way terrible things often were. The weave could not erase an injury. Nothing could. But it could move one. Lift a wound out of one body and set it down in another.

The healer would have to provide the destination.

She looked at her own hands. They were steady now, which surprised her.

Five years, she thought. Five years of walking past.

"Ma'am," said the guard, uneasily, because he had seen her expression change. "The commander said..."

"I know what the commander said."

She slid her left hand beneath the soldier's head, lifting it gently, and set her right palm over the black ruin of his wound. His skin was cold and clammy. Under her fingers, the warm little pendant pulsed once, like a second heartbeat.

She did not understand that, and she had no time to.

"Last chance," she said quietly. "If you have a god, now would be a good time to talk to him."

His lips parted. For an instant she thought he would argue.

Instead he said, very softly, "Thank you."

Elara closed her eyes, drew a breath that tasted of mud and iron, and began to open the weave.