Read Chapter 18: The Control Room

The door was a slab of reinforced steel with a keypad glowing amber beside it. Mercer pressed his palm flat against the metal—still cold, still humming with the train's vibration. Behind them, the maintenance bay was dark, the corpses of Sokolov's operatives lying where they'd fallen. No sound from the other side. No footsteps. No voice.

Camille was already at the keypad, her fingers moving fast, pulling a thin cable from her jacket and prizing open the access panel beneath it. "Sokolov locked it remotely. But it's not a deadlock—it's a command lock. It needs an override code from the control car itself."

"Can you bypass it?"

She didn't answer. Her tongue pressed against the inside of her cheek as she worked, exposing a nest of colored wires. The train shuddered beneath them—a low, mechanical groan that ran through the floor and up Mercer's spine. His side burned where the bullet had torn through. He pressed a hand against the wound and felt the warm soak of blood through his shirt. It was worse than he'd let on. The bleeding hadn't stopped, and each movement sent a spike of pain through his ribs.

"Talk to me," he said.

"There's a handshake protocol," she muttered, stripping a wire with her teeth. "Every two minutes, the control car pings the locked doors and confirms the locking sequence. If I spoof the response, the lock will release."

"How long?"

She glanced at him, her eyes flicking down to his hand pressed against his side. "Sixty seconds. If you don't bleed out first."

"Focus."

She turned back to the panel. Mercer leaned against the wall, breathing through the pain, his eyes fixed on the dark corridor behind them. If Sokolov came back with reinforcements, they were dead in this box. No exits except the one they'd crawled through, and that was a kill zone if anyone knew to hold it.

Camille's fingers moved with brutal efficiency. Thirty seconds passed. Twenty. Then the keypad blinked green and the lock disengaged with a heavy click.

"Go," she said, already moving.

Mercer pushed off the wall and forced his legs to cooperate. The door slid open into a narrow corridor lit by emergency strips—dim, amber, the kind of light that made everything look like a fever dream. The control car was twenty feet ahead. Its door was ajar, pale light spilling through the gap.

They moved low, weapons up. Mercer's aim wavered. He blinked, cleared the sweat from his eyes, and kept moving.

Camille reached the door first and pushed it open with her boot. No gunfire. No ambush. Just the hum of electronics and the soft glow of a dozen monitors.

The control room was smaller than he expected. A single operator's seat faced a curved console lined with screens. Most of them displayed navigation feeds, rail diagnostics, and outward camera views of the tunnel ahead—a black throat swallowing the train's headlights. But one screen in the center showed something else: a map of France, a blinking red line tracing their route, and at the end of it, a pulsing marker.

"Well," Mercer said, stepping inside. "Where are we going?"

Camille was already at the console, her hands on the keyboard. The screen flickered as she pulled up the navigation logs. "The train's original route was canceled at the last checkpoint. The system shows a single override command from the control car, issued twenty minutes ago."

"By whom?"

"Authentication code belongs to Garrick's personal override—the one that's supposed to only exist inside MI6 headquarters."

Mercer's jaw tightened. He limped to the seat and dropped into it, staring at the screen. The red line ended at a small dot in the French countryside, fifteen miles east of Calais. "What is that?"

Camille zoomed in. The label was a string of numbers and letters—a facility code he didn't recognize. She pulled up another window, running a search through the train's onboard database. The results came back a moment later. Her face went still.

"What?" Mercer asked.

"Not a facility," she said quietly. "A laboratory. Disused, classified, and officially decommissioned in 2003. It belongs to a shell company that was linked to—" She stopped, tapping at the keys. "Fournier Consulting Group."

Mercer felt the name land in his chest like a second bullet. Fournier. His mentor. The man whose debt had been used to manipulate him. The man whose cufflink he wore on his own wrist. The dead conductor Halloway had been wearing its match.

"Garrick's been sending us to Fournier's lab," he said.

"It's a terminus. There's no track beyond the depot. The train will arrive in thirty-seven minutes, and then it stops. Autopilot hold until manual release."

"So we can override it."

Camille shook her head. "No. The navigation system is locked to a hardware key, and the key is in the possession of whoever issued the override." She looked at the screen. "Garrick."

Mercer closed his eyes. The pain in his side had become a dull, throbbing pressure, but the ache in his chest was sharper. Fournier had trained him. Trusted him. Given him the cufflink as a marker of loyalty, a promise that they were part of something larger than themselves. And now Garrick—his own handler, the man who'd signed off on a hundred missions—had twisted that memory into a leash.

He pulled the comms unit from his belt and keyed the emergency frequency, the one that bypassed standard channels and went straight to MI6's secure relay in London. The mic crackled. Static. He tried again. There was a high-pitched whine, then nothing but the hiss of dead air.

"Jammed," he said.

Camille moved to the other side of the console, typing rapidly. "I can trace the jamming source. It's inside the train."

"So we're blind. And whoever's out there wants us to keep moving forward."

"Or they want us to stop." She paused, reading something on the screen. "The train's announcement system is still active. Someone's been broadcasting on a loop since we left the maintenance bay."

"Play it."

She tapped a key, and the speakers above them crackled to life. Sokolov's voice filled the room, calm and almost bored, as if he were reading a weather report.

"—and when the doors open, they'll find nothing but empty seats and a dead conductor whose last meal was paid for by a ghost. The case was never on the train, Mercer. It hasn't been for the last three stops. You were meant to chase it, and you did. Well done. But the exchange was never the point. The point was making sure you arrived. At the lab. With the cufflink."

The message cut out. Mercer looked at his wrist. The silver cufflink glinted under the amber light.

"It's a tracker," Camille said quietly.

"No." He shook his head. "It's a key."

He pulled the cufflink free, holding it up between his fingers. On its rounded edge, barely visible under the light, was a series of micro-engravings—a pattern too regular to be decorative. His thumb traced it once, twice. Not a design. Not an insignia.

Coordinates.

"Whatever's waiting at that lab," Mercer said, "I'm meant to be the one carrying this to it. And Garrick's assuming I'll follow the rails all the way there."

Camille looked at him, her eyes unreadable. "Will you?"

He turned the cufflink over, running his thumb across the engraving one more time. The wound in his side pulsed. He could feel the blood soaking through his jacket, a warm line creeping down his hip.

"I'm tired of being led," he said. "Let's find out who's actually paying for Fournier's debts."