Read Chapter 5: The Deserter

The chalk crumbled under Émile’s pick like dried bread, and for a moment he imagined he was back in the family pit at Anzin, twelve years old, watching his father swing the same rhythm. Then the roof shook—a dull crump far above—and chalk dust sifted down into his eyes.

“Marchand!” Sergeant Barbier’s voice carried through the narrow gallery. “Stop dreaming. We need the cross-cut cleared by dark.”

Émile wiped his face with the back of his sleeve and drove the pick again. The tunnel they were digging was a listening post, pushed twenty meters toward the German lines, and every shovel of spoil had to be carried back by hand so the enemy couldn’t spot the pale earth from the air. The work was mindless, which was exactly what Émile needed. For three days he had not slept more than an hour at a time. Every time he closed his eyes, he saw the bricked shaft under the German lines, and every time he opened them, he saw the German cigarette case hidden in his tunic lining, and the problem of six hundred kilograms of ammonal waiting to be planted over hollow ground he knew would swallow the whole ridge if the charge blew true.

He struck the chalk again, and the point of his pick punched through into empty air.

Émile froze. The sound was wrong. He worked the tool sideways, widening the hole, and a rush of cold air poured through—clean air, old air, the smell of deep cellars and stone that had not been disturbed in centuries.

“Barbier,” he said quietly. “Come here.”

The sergeant shuffled forward, lamp swinging. He peered at the hole, then at Émile, then back at the hole. His face went the color of tallow.

“Sweet Jesus,” Barbier whispered. “We’ve holed through.”

“Keep your voice down.” Émile knelt and worked the hole wider with his bare hands, careless of the sharp chalk edges. Beyond the breach was a void—black, open, big enough to swallow a man standing. He dropped a pebble in and counted. One. Two. Three. The pebble did not hit.

From somewhere in that darkness, very faint, came a sound. Not tapping this time. A moan.

Barbier crossed himself. “There’s someone down there.”

“Not someone,” Émile said. “Maybe several someones.” He reached for his lamp and leaned into the opening. The beam cut a narrow cone through the blackness, and at the edge of it, perhaps six meters below, he saw a face. Young, bearded, smeared with blood and chalk, eyes wide and white as eggs. The man wore the field-gray tunic of a German soldier. He was curled against the wall of the void, knees to chest, shivering violently.

“Deutscher,” Émile said. “Ein Gefangener.” He was not sure why he used the word. The man below did not react.

Barbier grabbed Émile’s arm. “Don’t be a fool. He could have a grenade.”

“He has nothing. Look at him.” Émile pulled back from the hole and dropped the rope end he was carrying down into the void. The German stared at it for a long moment, then slowly, mechanically, reached out and wrapped it around his wrist. Émile hauled him up.

The man weighed almost nothing. His uniform hung loose on a frame that was all sharp angles and hollows. Chalk dust coated him like flour, and his lips had cracked and split. He made no attempt to resist as Barbier and two other sappers pulled him over the lip of the breach. He just sat on the chalk floor, head hanging, repeating something under his breath.

“What’s he saying?” asked Privat, the youngest of the section.

Émile leaned closer. The words were German, but the rhythm was strange—not speech, more like a chant. He caught the word *Stadt*, and then *unter*, and then a word that made the back of his neck prickle: *Lux*.

The city. Below. Light.

“Barbier,” Émile said. “Fetch Lieutenant Moreau. Tell him we found a deserter in a hole.”

The interrogation took place in the dugout under the support line, where the rain could not reach them and the walls leaked only the low, constant vibration of distant bombardment. Moreau sat behind a field table, a cigarette burning between his fingers, his monocle fixed on the prisoner. Klaus—that was the name he had given, when he finally stopped shaking enough to speak—was tied to a chair, his hands bound behind him. Émile stood in the corner, watching.

“Ask him again,” Moreau said. “How did he get under our lines?”

Émile translated. Klaus looked up, and for a moment his eyes were clear—horribly clear, the eyes of a man who had seen something that had scraped the inside of his skull.

“I was mining,” Klaus said, in slow, accented French that made Émile start. “I was mining under your trenches. My crew—we broke through a wall. A wall of brick. Behind it was a passage, and the passage went down. We followed it. It went on and on. We walked for hours. We found—” He stopped, and his mouth worked soundlessly.

“Found what?” Moreau said.

Klaus shook his head. “Houses. Streets. A square. All underground. All old. And at the center, a light. Not fire. A light that hums.”

Moreau laughed, but there was no humor in it. “He’s mad. A deserter and a madman. How convenient.”

“I’m not mad,” Klaus said, with a flicker of force that silenced the room. “I was a miner. In civilian life. From the Ruhr. I know what tunnels look like. I know how deep we were when we broke through. Six hundred meters.” He paused. “Your engineers can’t dig six hundred meters. Neither can ours. But someone did.”

Moreau stood. He walked around the table, studying Klaus the way a butcher studies a cut of meat. “Be honest with me. You’re a spy. You were caught crawling through our lines, and now you’ll tell me any story to save your skin.”

Klaus did not answer.

“I’m going to ask you for the layout of your mining galleries under this sector,” Moreau continued. “And then I’m going to send you to the rear, where you will be shot. Unless you tell me the truth now.”

Klaus raised his head. “The truth?” He looked at Émile, and for a moment, Émile saw something pass across his face—recognition, perhaps, of a man who had also been underground. “The truth is that both armies are digging into something that was there before either of us. Something that was there before the French and the Germans existed. And if you keep digging, you will wake it.”

Moreau’s hand moved to the revolver at his hip. Émile took a step forward.

“Lieutenant,” Émile said. “He’s a sapper. He’s not a spy. Look at his hands—calloused, chalk-stained, broken nails. He’s been digging, same as us. He came up under our lines by mistake, because the tunnels down there don’t follow the front. They follow the geography of the world beneath.”

Moreau turned on him slowly. “Marchand. Do you know what the word *fraternization* means? It’s what happens when a French soldier forgets which side he’s on and starts making excuses for the enemy.”

“I’m not making excuses. I’m telling you what I saw.”

“You saw a hole in the ground and a lunatic in it.” Moreau’s voice was flat. “And you—” He stepped closer to Émile, close enough that Émile could smell the brandy on his breath. “You have been different since the tunnel under the German lines. Roussel told me about your little adventure. And now you’re standing here, defending a Boche who’s trying to convince us the ground is hollow.” He jabbed a finger into Émile’s chest. “You’re on thin ice, Marchand. One more word, and I’ll have you tied up next to him.”

Émile held his tongue. Moreau nodded, satisfied, and turned back to Klaus. “Take him to the rear post. I want a firing squad at dawn.”

The men took Klaus out. Émile stood alone in the dugout, the lamp guttering, the vibration of the guns humming through the floor. He looked down at his hands. His fingers were shaking.

That night, the rain came down in sheets, hammering the corrugated iron of the dugout roof, drowning the sound of foot traffic and gunfire alike. Émile lay awake on his bunk, listening to the rhythm of the drops against the metal, and beneath that rhythm, underneath the rain and the war and the thud of distant artillery, he heard it again.

Knock. Knock-knock. Knock.

The pattern was different now. It was speaking to him, insisting. And it was answered.

Émile sat up. He pulled on his boots and his tunic, took his lamp, and slipped out into the trench. The rain swallowed his footsteps. He made his way to the chalk dugout where they had held Klaus, expecting to find it empty, expecting only the lingering smell of sweat and terror.

The ropes were cut. Not frayed, not untied. Cut clean, with a blade.

And on the overturned chair, weighed down by a fragment of chalk, was a scrap of paper, folded small. Émile picked it up. The writing was in French, though the hand was unsteady, like the hand of a man who had learned the language late and under duress.

*Ask for the Blue Madonna. The abbey. She will show you the way down.*

Émile read it twice. Then he tucked the note into his tunic, next to the German cigarette case, and stood very still in the dark, listening.

The tapping had stopped.

But somewhere in the earth below, he was quite certain, Klaus was walking.