The numbers didn't work, and Ethan kept walking anyway.

  That was the job. Not solving the math—not yet. The math would still be wrong in ten minutes. Right now, the job was keeping twelve people moving across frozen ground toward a stone that might save a valley, and the job didn't care about arithmetic.

  He shifted Cadoc's chain to his right hand. The iron had warmed slightly where it pressed against his forearm, which meant his body heat was leaching into the metal instead of staying where it belonged. A bad trade. He made it anyway and kept pace with the group.

  The boy was next.

  Ethan had been watching him since the halfway mark. Fifteen years old, maybe younger, jaw locked so tight the muscles in his neck stood out. He'd been walking on willpower alone for the last quarter mile, and willpower is a fuel that burns fast and leaves nothing behind. His steps had gone from short to shuffling, and now they'd stopped being steps at all. His feet dragged furrows in the frozen mud, each one shorter than the last.

  "Hey." Ethan fell in beside him. "What's your name?"

  The boy looked at him. His eyes were glassy. Not with tears—with distance, the way a window looks when the frost covers it from the inside.

  "I don't..." He stopped walking. "I had it a minute ago."

  That was when Ethan understood what the Grey Frost actually did.

  It didn't attack. It didn't show you terrible visions or whisper dark truths. It subtracted. Quietly. Precisely. The way water dissolves salt—not all at once, but grain by grain, until the thing you were holding isn't there anymore and you can't remember when you lost it.

  The boy couldn't remember his own name. Not because the memory was buried or blocked. The memory was gone. The space where it had been was smooth and empty, and the boy was staring at that empty space with the look of someone who'd reached for a railing and found air.

  "It's alright," Ethan said. He didn't know the boy's name either. Brenneth had said it during introductions, but the Frost had been in the air even then, and the name hadn't stuck. "Keep walking. I've got you."

  The boy tried. His right foot came forward. His left foot didn't follow.

  "I can't remember why," the boy said. His voice had gone thin and flat. "Why are we walking?"

  Ethan picked up his chain.

  Two chains now. Cadoc's on the right arm, the boy's on the left. The iron was heavier than it should have been, and not just from the cold. Each link carried something besides weight—a drag that pulled backward, toward the village, toward warmth, toward the seductive lie that stopping was the same as surviving.

  The boy sat down in the mud. He did it the way children sit—straight down, no attempt to catch himself. His chain pulled taut between his wrist and Ethan's arm and held there, a fifteen-foot leash connecting a standing man to a sitting one.

  Ethan dragged him.

  Not far. Not hard. Just enough to keep the chain from going slack, because slack meant the boy had stopped being connected to the group, and disconnection was what the Frost wanted. The boy's boots cut twin lines through the frozen ground, and after maybe twenty feet he got his legs under him again. Not walking, exactly. Being towed. But moving.

  One down. Eleven still on their feet.

  The blacksmith's apprentice went next, and he went angry.

  "This is pointless." He stopped, chain rattling, and turned back toward the village. His face was flushed where everyone else's was pale. "Look at this. Half of us can barely walk. The Stone's dead. We're walking to our own funerals and pretending it means something."

  "Keep moving," Brenneth said from the front. She didn't turn around.

  "For what?" The apprentice's voice cracked. "For a rock? For a ritual none of us know how to do? The druids are dead. The people who knew how to use the Stone are dead, and we're—we're bakers and farmers and goatherds playing at saving the world."

  Nobody answered him. The group kept moving, and his chain went taut, and then slack, and then taut again as the distance grew.

  Ethan came back for him. The apprentice was standing with his fists clenched and his jaw trembling, not from cold but from the specific anger of someone who has just said the true thing nobody wanted to hear.

  "You're right," Ethan told him.

  The apprentice blinked.

  "The druids are dead. Nobody here knows exactly how the ritual works. This might not work at all." Ethan picked up his chain. Three now. His shoulders had started to burn. "But the alternative is sitting down in the mud and waiting for the cold to finish the job. So."

  The apprentice stared at him for a long moment. Then his legs gave out—not dramatically, not a collapse. His knees just stopped locking. He went down to the frozen ground and stayed there, face blank, the anger draining out of him so fast it left nothing behind.

  The Frost had taken the anger. Even that.

  Ethan wrapped the third chain around his left forearm and kept walking.

  The goatherd stopped counting.

  He'd been counting the group since they left the village—touching each chain with his eyes, lips moving, tallying. Twelve. Always twelve. A nervous habit, compulsive and constant, and it had kept him grounded for most of the walk because counting was a task and tasks kept the mind occupied.

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  Now he stood in the middle of the path with his finger pointed at nothing, mouth open, eyes wide.

  "Seven," he said. "Seven... and then..." He turned in a slow circle, pointing at people who were there, pointing at spaces where people weren't. "Seven and then the next one. The next one comes after seven."

  "Eight," Ethan said.

  The goatherd looked at him with pure gratitude, as if Ethan had handed him water in a desert. "Eight. Yes. Eight, nine, ten..." He trailed off. His hand dropped. "I've lost it. I had a thing I was doing and I've lost it."

  His chain was already slack. Ethan picked it up. Four.

  Hallen the baker went quietly.

  He unwrapped the bread first. Held it in both hands, turned it over, studied the crust. It had gone cold and hard in the frozen air, the warmth that had fogged when they left the village long since bled out.

  "I made this," Hallen said. Not to Ethan. Not to anyone. Just to the bread. "I remember making it. I remember the flour and the water and the heat." He paused. "I don't remember why."

  "For the walk," Ethan said.

  "The walk." Hallen nodded slowly. He put the bread down on the ground, carefully, the way you set down something that matters even when you can't remember why it matters. Then he sat beside it and folded his hands in his lap.

  Five chains. Ethan's arms were full of iron. The weight pulled at his shoulders and his lower back and the muscles along his spine that you don't think about until they're screaming. Every step cost more than the last, and the cost was compounding.

  He looked ahead. The Keepstone was close now—three hundred yards, maybe less. Close enough to see the individual standing stones in the circle, each one the height of a man's chest, each with an iron socket at its base waiting for a chain that might never arrive. Close enough to see that the light inside the monolith had gone from stuttering to barely there. A pulse every few seconds, faint and irregular.

  The singer's humming had stopped. Ethan turned and found her still walking, still upright, but her mouth was closed and her eyes had gone distant. Not vacant. Thinking. Trying to remember the tune she'd been carrying since the village.

  "The song," Ethan said. "What was it?"

  She looked at him. Her lips moved without sound. Then she started humming again—but it was wrong. Different melody. Different rhythm. She knew she'd lost the original and was building a new one from what was left, note by note, the way you rebuild a wall with half the stones missing.

  She kept walking. The new melody held.

  Two more fell in the last two hundred yards.

  A man Ethan had barely registered—middle-aged, thin-faced, moving at the back of the group since they'd left the village. He sat down without a word, without a sound, as if his body had simply made a decision his mind was no longer equipped to argue with. His eyes were open but they weren't looking at anything.

  A woman who'd been walking with her arms crossed over her chest, chin tucked, fighting the cold with posture alone. She made it to within a hundred and fifty yards of the circle before she stopped, looked at the Keepstone, and asked: "What is that?"

  She'd been staring at it for the entire walk. The Frost had eaten the answer.

  Seven chains. Ethan couldn't feel his hands anymore. The iron was wrapped around both forearms in overlapping coils, the excess dragging behind him, cutting parallel lines through the frozen ground. He walked hunched forward, not because of the cold but because the weight demanded it. Straight-backed was a luxury. Upright was a negotiation.

  Cadoc fell for the last time thirty feet from the stone circle.

  He'd been walking since Ethan picked up his chain in the middle stretch—walking on borrowed momentum, each step a little shorter, each breath a little shallower. He'd stopped talking. Stopped looking up. He'd been following the sound of the chains ahead of him, and when that sound stopped carrying over the wind, he stopped too.

  He went to his knees first. Then his hands. Then flat, face against the frozen ground, and didn't move again.

  "Cadoc." Ethan's voice came out raw. "Thirty feet."

  Nothing.

  He added the eighth chain to the weight on his arms and walked the last thirty feet dragging eight lines of iron through the mud behind him. The chains of the fallen fanned out in his wake, each one connecting him to a body on the ground, radiating outward from him in long black lines that cut the grey landscape into sections.

  Five people walked through the standing-stone circle.

  Brenneth first. She hadn't looked back once during the entire walk. Her spine was straight and her chain was taut and her boots hit the flagstone path with the same rhythm they'd had leaving the village. Whatever the Frost had tried to take from her, she'd either held it or decided she didn't need it.

  Torren. The farmer had gone pale, his big hands shaking, but his stride hadn't changed. He walked the way he'd walked every day of his working life—one foot, then the other, because the field doesn't care if you're tired.

  Syla. Her fingers were locked around the locket at her throat and her lips were moving. Ethan could hear fragments: Dalla. Perin. Dalla. Perin. She'd been saying their names for the last quarter mile, repeating them against the Frost's subtraction, holding the two words that mattered most with everything she had left. Her eyes were red and her face was wet, but she was walking.

  The singer. The new melody had held. It was thinner than the original—fewer notes, less structure—but it was hers and it was continuous and it gave the remaining walkers a beat to move to. She entered the circle humming, and the sound bounced off the standing stones and came back to her doubled, the acoustics of the ring adding a resonance the open valley had swallowed.

  The woman with raw eyes. She walked in last, steady, unhurried, her empty hands open at her sides. The Frost couldn't pull you toward something you'd already lost, and it couldn't take memories that were already gone. She'd come into this walk already stripped, and that had made her, in the end, the strongest of them all. Not the bravest. Not the toughest. Just the one with the least left to steal.

  Five.

  Ethan came through the circle behind them with eight chains wrapped around his arms and seven bodies scattered across the valley floor behind him. His boots hit the flagstone and the sound changed—solid instead of soft, stone instead of mud. The Keepstone loomed above them, two stories of grey-white rock with veins of fading light, the pulse so weak now it was barely visible in the daylight.

  He let the chains drop.

  The iron hit the flagstone with a sound that echoed off the standing stones and rolled out across the valley. Eight chains, splayed in a starburst pattern around his feet. His arms throbbed. His shoulders felt like they'd been pulled from their sockets and put back wrong. His hands were raw where the iron had bitten through his gloves.

  Brenneth looked at the twelve stone pillars. Looked at the five people standing. Looked at the seven bodies lying in the mud between the circle and the village.

  "Twelve positions," she said. Her voice was flat. The voice of someone doing arithmetic they already know the answer to. "Twelve chains in the sockets. Twelve people channeling simultaneously. The Stone takes the combined warmth and amplifies it."

  "We have five," Torren said.

  "We have five."

  The Grey Frost had dropped below the passes. Ethan could see it now—not just a thickening of the air but a visible front, grey-white and featureless, rolling down the mountain slopes like fog with weight behind it. Moving slowly. Taking its time. An hour, maybe less, before it reached the valley floor.

  Five people. Twelve positions. A stone going dark.

  Syla's hand was still on her locket. Torren was staring at the pillars, counting them, as if counting might change the total. The singer had stopped humming. The woman with raw eyes stood with her hands at her sides and waited for someone to say the thing everyone was already thinking.

  Brenneth said it.

  "It's not enough."

  Ethan looked at the chains on the ground. At the eight lines of iron radiating from where he stood, each one connecting him to someone who had fallen because the cold had found what they were carrying and taken it away. Names. Numbers. Purpose. Anger. Music. The small internal things that keep a person moving when the body wants to stop.

  He looked at the twelve pillars. At the iron sockets, each one sized to hold a chain's clasp. At the Keepstone, its pulse barely visible, dimming toward dark.

  Five standing. Seven fallen. Twelve needed.

  The numbers still didn't work.