Read Chapter 29: The Tunnel

The reeds had thinned by the time Jack and Émile reached the southern pylon, their clothes sodden and caked with black marsh mud. The six prisoners followed in a ragged line behind them, eyes hollow, moving on whatever fuel their bodies had left. The bridge loomed above them, a steel skeleton against a sky the color of old iron.

Émile dropped to his knees at the base of the pylon, running his fingers over the concrete until he found a rusted iron ring set flush into the ground. He looked up at Jack with Henri’s eyes—the same sharp intelligence, the same quiet stubbornness.

“You’ll want to hold your breath,” Émile said. “It’s not kind.”

He pulled the ring. A section of earth and sod lifted on concealed hinges, revealing a dark mouth and the corroded rungs of a ladder descending into blackness. The smell that rose from below was ancient and wet—stagnant water, rot, and the mineral tang of rust.

Jack turned to the prisoners. A gaunt man named Michel, a kid named Pierre who couldn’t be older than eighteen, and three others whose names Jack had already forgotten. Their faces were painted with exhaustion and fear.

“Stay here,” Jack said. “Keep low. If you see Germans, scatter. Don’t lead them to us.”

Michel nodded, his jaw tight. “And if you don’t come back?”

“Then you’re on your own.” Jack turned away before the question could hang any heavier. He swung his legs over the edge, found the first rung with his boot, and descended.

The ladder was slick with condensation. Each rung sent a shudder through his arms. The concrete walls closed in around him until he felt the familiar tightness in his chest—the one he always got in tight places, the one he’d learned to push through in training. After twenty feet, his boots hit water.

Émile landed beside him a moment later, the splash echoing unnaturally in the dark. The tunnel stretched ahead, a low concrete bore barely four feet high, half-filled with slow-moving water that smelled of fuel and sewage. Faint light filtered from somewhere ahead, catching the surface of the water in sickly ribbons.

“It runs beneath the entire span,” Émile whispered. “Maintenance access, built when the bridge was new. The engineers had to be able to inspect the pylons from below. It feeds into a junction chamber at the center—that’s where the demolition charges would be.”

Jack’s eyes adjusted. He could make out cables snaking along the curved ceiling—thick, rubber-sheathed, newer than the tunnel itself. “Those weren’t here when the bridge was built.”

Émile followed his gaze and shook his head. “Kessler’s wiring.”

They moved forward in a low crouch, water swirling around their knees. Every step made a soft sucking sound that seemed enormous in the confined space. Jack checked his watch. He’d left the safehouse before dawn. The light filtering through the tunnel grates above them told him it was mid-morning now. The invasion fleet would be crossing the Channel if the weather held, their brave boys packed into landing craft, heading toward beaches that would run red with blood—if the bridge wasn’t dealt with first.

The tunnel curved, and the light grew stronger. When they rounded the bend, Jack saw it.

The junction chamber was a widening in the bore, a rectangular space about fifteen feet across. And it was a small fortress of explosive engineering. Packed charges lined every wall—cylindrical steel drums connected by a web of wiring, stacked in neat rows that spoke to German precision. There had to be six hundred pounds of explosive in that chamber, mounted against the concrete supports of the bridge above.

In the center of the web sat a junction box, its steel casing stamped with the Wehrmacht eagle. Dozens of wires converged on it from the charges, and one thick cable ran from its base, disappearing into the wall in the direction of the château.

The fail-safe line.

Émile waded into the chamber, his hand tracing the cables with something like reverence. “It’s clever,” he said quietly. “The main detonator is wired to the junction box. But so is the fail-safe. If we cut the main line, the secondary line runs straight back to the château. They’ll know it’s been disconnected the moment voltage drops.”

Jack sloshed closer, studying the wiring. “So we don’t cut it. We bypass it.”

Émile’s eyes met his. “You know how to do that?”

“I know how it works in theory.” Jack pulled a small leather pouch from his vest, unrolled it to reveal the tools he’d carried from a dozen demolitions schools. Pliers, strippers, wire cutters, a spool of copper wire. “But theory and German engineering don’t always agree.”

He knelt in the water beside the junction box, water lapping at his thighs, and opened the casing. The inside was a nest of carefully bundled wires, each tagged with a small plastic label bearing German script. Jack squinted at them, reading what he could.

“Which one is the fail-safe?”

Émile moved beside him, studying the labels. “There.” He pointed to a wire that ran alone, separated from the others by a tension clamp. It was tagged *Sicherungskreis Rückkopplung*—feedback circuit.

“That’s a monitoring line,” Jack said. “Cut that, no one knows about it until the check. But the actual detonation signal comes from…”

He sorted through the bundles, pulling them gently apart, reading labels. *Zünder Haupt*—main detonator. *Zünder Reserve*—reserve detonator. *Hauptzündkreis*—main firing circuit.

His fingers stopped. A wire tagged *Netzüberwachung*—network monitoring. That was the one. The wire would send a continuous signal back to the château. The moment the signal stopped, Kessler would know.

“Okay,” Jack breathed. “Here’s what we do. We disconnect the main firing circuit and run a jumper wire between the monitor and a portable power source—keep the voltage steady so Kessler’s instruments read normal. We disarm the charges at the source. And we leave a dummy line in place so the engineers’ physical check finds nothing.”

Émile nodded. “You carry a portable source?”

“Small battery pack. Military issue. It’s got enough juice to keep a monitoring signal alive for half an hour.” He unzipped his chest pocket, pulling out a compact black unit with two lead wires. “We have to be quick. And we have to be exact.”

He was about to speak again when a sound echoed down the tunnel—a scrape, metallic, the sound of steel against concrete. Both men froze.

Jack’s hand went to his knife. Émile’s went white on the junction box.

“What was that?” Jack whispered.

Émile’s voice was barely audible. “An inspection hatch. Closer than the one we came through. They’re checking the charges.”

“How often?”

“Every hour, if Kessler follows standard procedure.”

Jack looked at his watch. He didn’t know how long they’d been in the tunnel. It could have been twenty minutes. It could have been fifty.

He turned back to the junction box and closed his eyes, forcing his hands to steady. “Then we work fast.”

He stripped the first wire with his teeth, copper glinting in the gloom, and bent to the work with the weight of the invasion pressing down on his shoulders—and the sound of a German engineer’s boots echoing closer through the tunnel.