Read Chapter 30: The Hostage Extraction

The maintenance bay smelled of oil and damp concrete, and the utility tunnel stretched away from Sokolov like a throat waiting to swallow them. Mercer kept his hands visible, the Beretta hanging loose at his side, barrel angled at the floor. Sokolov's smile was the same glacier-calm expression he'd worn in the undercroft, but his eyes kept flicking to Dr. Vernet, who sat bound to a pipe near the wall, her lab coat torn at the shoulder.

"Lower the weapon completely," Sokolov said. "Not just at your side. On the floor. Kick it toward me."

"Then what?" Mercer asked.

"Then you and your DGSI friend walk back the way you came, and I walk out of here with the doctor and the vial. Nobody has to die tonight."

Camille shifted behind him, a whisper of movement. Mercer read her without looking—she was two steps back, left hand sliding toward the tool belt she'd taken off a dead maintenance worker two floors up. He needed to give her time.

"You have the vial," Mercer said. "You don't need her."

Vernet raised her head. Her face was pale, a bruise flowering along her jawline, but her eyes were sharp. "He needs me to synthesize the dispersal sequence. The vial's useless without the aerosolization matrix."

Sokolov's smile tightened. "Doctor, I'd advise you not to volunteer information."

"Which means it's true," Camille said.

Sokolov's attention flicked to her for a fraction of a second. Mercer moved.

He didn't go for his weapon—that would've been predictable, useless, Sokolov had the drop on them and the vial was clutched in his left hand like a talisman. Instead, Mercer reached for the red manual pull station mounted on the tunnel wall three feet to his right. He yanked it down as Sokolov's pistol came up.

The klaxon split the air. Red strobes erupted along the tunnel ceiling, painting the concrete in violent pulses of light. Somewhere above them, a recorded voice began repeating instructions in French: *Veuillez évacuer le bâtiment par les sorties les plus proches.*

Sokolov's aim wavered. He fired once, wild, the round sparking off the pipe beside Vernet's head. She screamed and twisted, and Mercer threw himself toward her at the same moment Camille launched forward.

Camille hit Sokolov low and fast, using the stolen wrench from the tool belt as a bludgeon. The metal connected with his forearm, and the pistol clattered away. The vial stayed in his other hand, and he brought it up like a shield, shouting something in Russian that Mercer's brain didn't have time to translate. Camille didn't stop. She drove a knee into his midsection, and Sokolov buckled, but he wrapped his free arm around her neck and pulled her into a headlock in the same motion.

"Run!" Camille shouted, her voice strained. "Take the doctor and run!"

"What about—"

"RUN, MERCER!"

Sokolov's fist connected with her temple. Her head snapped back, but she didn't go down—she twisted, bit his wrist, and the Russian howled.

Mercer grabbed Vernet under the arm and hauled her upright. Her hands were still bound behind her back, duct tape wrapped thick around her wrists. He half-carried her toward the far end of the utility tunnel, away from the maintenance bay, away from the strobes and the screaming alarm. Behind them, he heard the wet crunch of a body hitting concrete and hoped it was Sokolov's.

They emerged into a wider service corridor lined with gas pipes, their surfaces cool and humming with the building's quiet heartbeat. Vernet stumbled, and Mercer caught her before she fell.

"Which way?" he asked.

"The central distribution manifold," she said through gritted teeth. "About a hundred meters northwest. The device is wired to the regulator assembly there."

"What about the train?" They were running now, Mercer's feet slapping against the concrete in rhythm with the alarm bells. "The decoy—"

"It's still coming. The driver can't stop it remotely, and there's a manual override on board that only the train crew knows about. It arrives at Gare du Nord in—" she checked her watch with a visible effort "—thirty-one minutes."

"The toxin on board is a saline dummy."

"Yes. But the gas line device is real. When the train enters the station platform, a pressure sensor triggers the flow of gas into the Grand Palais ventilation system." She was breathing hard, tears of exertion and fear tracking through the dust on her face. "The aerosolized form of the toxin—my formula—was meant to be in the vial Sokolov has. Without it, the explosion still kills people, but it's just gas. A gas explosion. Fifty, maybe a hundred casualties."

"And with the vial?"

"It looks like a chemical attack engineered by the Channel Transport Commission's own oversight committee, using a weapon developed by the French government's own researchers." Her voice cracked. "It would end public trust in the entire Channel infrastructure. Britain would demand the tunnel be shuttered indefinitely. The economic damage would be—"

"Catastrophic. I know." Mercer pulled her around a corner and saw it ahead: a junction box bristling with gauges and valves and, wired to its base, a black rectangular device the size of a car battery.

He stopped. Vernet collided with his back.

"There it is," she said. "The timer's internal. It counts down from activation, triggered by the platform sensor."

Mercer approached the device slowly, as if it were a sleeping animal. The casing was matte black, sealed with industrial adhesive. No visible wiring except a single gray cable running up into the junction box, disappearing into the gas line's control circuitry.

"Can you disarm it?"

"Not without tools." Vernet held up her bound wrists. "K-type voltage meter, a grounding strap, and at least twenty minutes to safely interrupt the connection to the regulator."

"Twenty minutes." The alarm bells still rang overhead. In the distance, Mercer heard the echo of footsteps—more than one pair, moving fast. "We have less."

"Then we have less."

Mercer pulled his knife and cut her bonds. The tape fell away, and she flexed her fingers painfully, already scanning the device with a technician's eyes.

"Can you stall the train?" he asked.

"The manual override requires physical access to the driver's cabin. The train is sealed and moving."

"Then I'll get on the train."

She looked at him. "You can't get on a sealed train that doesn't stop."

"Doors on the carriages lock from the outside, but the driver's cabin has an emergency access panel on the rear of the first locomotive. It's unlocked from the outside only by a special rail key." He pulled out his phone—no signal down here—and cursed. "I'll find another way."

The footsteps grew louder. Mercer glanced back the way they'd come and saw a silhouette rounding the corner forty meters behind them. Not Sokolov. Taller, broader, moving with a prowler's deliberate stride.

Remi.

He stepped into the strobe light and smiled, the red flash catching the silver in his hair. There was blood on his knuckles.

"Agent Mercer," Remi said, his voice carrying easily over the alarm. "I was hoping you'd lead me to the device. Saves me the trouble of finding it myself."

Mercer positioned himself between Remi and Vernet, the Beretta coming up in a two-handed grip.

"Where's Camille?"

Remi's smile didn't waver. "Soon to be a liability I no longer need. But I'm a reasonable man—a man with negotiation to offer." He held up his empty hands. "You don't want to fight me, Mercer. You want to save the people on that train. The people you were sent to protect. And I can help you do that."

"By what—choosing who dies?"

"No." Remi gestured to the cufflink still clipped to Mercer's cuff, the one he'd been wearing since the Sangatte rendezvous. "By telling you what that cufflink means."

Mercer glanced down at it. The small engraved lion gleamed dimly in the red-strobing light.

"I'm listening."