Read Chapter 16: The Other Tunnel

The intercom crackled once, then died. The silence that followed was worse than Sokolov's voice had been—heavier, more absolute, like the air itself had been sucked out of the maintenance bay.

Camille pressed her palm against the dead speaker grille, then pulled it back as if burned. "He cut us off."

"He got what he wanted." Mercer slid down the wall, one hand clamped over his side. The blood had soaked through his shirt and was starting to darken his trousers. Each breath came with a wet rasp he tried to hide. "He wanted us to know he's in control of the train. Now he doesn't need to gloat anymore."

Camille turned from the intercom, her eyes tracking to the fresh blood on his fingers. "You need to sit down properly. Let me look at that—"

"No time." He pushed himself upright, swaying once before finding his balance. The bay was small, windowless, filled with fuse boxes and relay cabinets that hummed with the train's diverted power. One door led back the way they'd crawled. The other was the control car, locked from the other side. "We need a way in."

Camille was already moving around the perimeter of the bay, running her fingers along the seams of the metal cabinets. She stopped at the far corner, where a bundle of cables ran through a conduit into the ceiling. She traced it backward to a small access panel marked *RÉSEAU DE SERVICE*.

"The service network." She popped the panel open with her knife. Inside, a tangle of wires and fiber-optic connectors gleamed. "The train's internal comms run through here. If I can bypass the locks from the hardware side—"

"Then you'd be opening the control car door."

"If I can identify which line controls the magnetic locks." She was already working, her fingers moving with practiced precision through the spaghetti of cables. "Sokolov thinks he's cut us off. He doesn't know this train was refitted three years ago with a backup system that bypasses the PA."

Mercer limped closer, watching her work. "How do you know that?"

She didn't look up. "I read the maintenance manifests before we boarded. Standard procedure."

He studied the angle of her shoulders, the way she avoided his gaze. "Camille."

Her fingers paused. Just for a moment.

"What else did you read in those manifests?"

She found the cable she was looking for—a thick black line wrapped in red tape—and stripped it clean. "There's a second tunnel," she said quietly. "A parallel maintenance line that runs alongside the main passenger route. It's not on any public map. It's used for emergency evacuations and discreet military movement."

Mercer's chest tightened. "Sokolov rerouted us onto it."

"Not us." She attached a small device to the exposed wire, and a readout flickered to life in her palm. "The train. The entire train, passengers and all. He didn't just hijack the control car—he hijacked the track switching system from somewhere inside. He had help on the outside."

"Someone in the operations center."

"Someone with high-level clearance." Camille finally met his eyes. "The same person who paid off your debt. The same person who dangled your father's name in front of you."

The silence stretched between them, filled only by the hum of the train's rerouted engines. Mercer thought of Fournier, of the man who'd taught him everything about fieldwork, about trust and its limits. Fournier had given him the cufflinks—a pair of silver ovals etched with a pattern that looked like interlocking rings. "A reminder," Fournier had said, "that even the most beautiful things can be locked together."

Mercer hadn't worn them in years.

"You said the MI6 mole had financial interest in my survival," he said. "What else did you find out about them? Before we boarded, when you were reading those manifests—what else were you looking for?"

Camille's jaw tightened. A lock clicked somewhere beyond the wall, and the control car door's indicator light shifted from red to green. "I was looking for a way to survive Sokolov," she said. "Just like you."

The door slid open a crack. Cold air seeped through, carrying the smell of ozone and metal.

Mercer moved first, pushing through the gap with his good shoulder. The control car was dimly lit, emergency lighting casting long shadows across banks of dark monitors. A single chair sat empty before a console that still glowed with the train's automated systems. There was no sign of Sokolov.

"He's gone." Camille stepped in behind him, her weapon drawn. "He used the PA to taunt us, then slipped out through the maintenance exit while we were sealed off."

"The silver case." Mercer scanned the room. "He handed it off at the breach point. His second rendezvous must be ahead."

Camille moved to the main console, studying the navigation readout. Her face went pale. "Mercer."

He joined her, reading the numbers over her shoulder. The train's destination indicator no longer read Paris-Gare du Nord. It had been reprogrammed to a coordinates string—a location deep in the industrial outskirts of the city, not marked on any passenger rail map.

"He's not taking the train to a station," Camille said. "He's taking it to a warehouse. An exchange point. And he's arriving early, which means whoever he's meeting didn't expect us to still be alive."

The train lurched. Both of them grabbed the console for balance. On the monitors, a row of camera feeds flickered to life, showing the passenger cars beyond. Most were empty—the evacuation earlier had cleared them—but one feed showed a figure moving through the dining car, tall and unhurried.

It wasn't Sokolov.

The figure turned toward the camera. He wore a dark suit, and the light caught the cuff of his jacket, glinting off a silver oval link. The same interlocking pattern Mercer knew from his own cufflinks. Fournier's design. Fournier's gift.

"No." The word came out before Mercer could stop it.

Camille looked at him sharply. "Who is that?"

The figure reached the camera and killed the feed. The control car went dark except for the glow of the navigation screen.

Mercer pressed a hand against the wound in his side. The familiar ache had sharpened to a knife-edge. He'd known Fournier's death was suspicious. He'd known the debt was leverage. But this—a ghost walking the length of their train in the dead man's cufflinks—was something else entirely.

"Options," he said, forcing his voice steady. "We're sealed in a maintenance tunnel, bleeding, with a dead intercom and a man who should be dead walking our passenger cars."

Camille's expression hardened. "We go forward."

"I'm not walking into an ambush blind."

"You're not going alone." She pulled a handheld thermal scanner from her belt and extended it toward the car ahead. "One heat signature in the next car. Moving slow. He's waiting for us."

The train wheels shuddered beneath them, picking up speed. The coordinates on the navigation screen ticked down, minute by minute, pulling them toward an unknown destination.

Mercer looked at the cufflink on his own wrist—the one he hadn't taken off in years, the one Fournier had given him the day of his first field assignment. Everything circled back to the same name. Everything circled back to a man who, if the files were to be believed, had been buried in a closed-casket ceremony in Surrey six months ago.

He pulled the cufflink off and dropped it on the console. It landed with a quiet click.

"Then we go forward," he said. "And we find out who's wearing Fournier's face."

The train hurtled on through the dark.