Read Chapter 12: The Trap

The service tunnel curved ahead of Camille like a concrete throat, swallowing the beam of her penlight. The air smelled of diesel and wet stone, and somewhere above them the train sat silent in its maintenance spur—a dead iron whale they had crawled out of the belly of.

Mercer followed two paces behind, his own light low, his shoulders brushing the ribbed walls. They had dropped through a maintenance hatch in the floor of carriage B, into a service passage that ran parallel to the main rail bed. The plan was simple: reach the rear access point through the tunnel itself, cut off Sokolov before he could slip through the breach, and get the container back before Fournier's men turned the train into a shooting gallery.

Camille stopped. Her hand went up, flat.

Mercer killed his light. She did the same, and they stood in absolute darkness, breathing shallow. Somewhere ahead—faint, rhythmic—a drip of water. Then another sound. A click. Delicate. Metallic. The kind of sound a small device makes when it finishes arming itself.

"Stay here," Camille whispered.

"Like hell."

She was already moving forward, her footsteps barely audible. Mercer followed, letting his eyes adjust to the sliver of emergency lighting that bled from a crack in the concrete ceiling. He could see her silhouette crouch low, her fingers tracing the junction box on the wall.

She turned. In the dim light, her face was hard to read, but her voice carried a razor's edge. "Listening device. Active. Someone knew we'd come through here."

Mercer's jaw tightened. "Then we're walking into a trap."

"Unless it's a siren, meant to push us back." She pried the device loose with the edge of her knife—a small disc, commercial-grade, the kind sold at any electronics stall in Paris. "Cheap. Disposable. Whoever planted it didn't want to spend much."

"Or wanted us to find it." Mercer scanned the tunnel ahead. Thirty yards on, the passage branched—one route continuing straight, another angling upward toward a service ladder. "Which way does your gut say?"

"Neither." Camille pocketed the device. "It says whoever planted this is waiting for us to make a choice."

A low hum began to vibrate through the concrete floor. Mercer felt it in his boots first, then his teeth. The hum grew into a thrum, and then a sharp crack split the air behind them—not gunfire, but something worse. A percussive blast that threw a wave of heat and dust down the passage.

Mercer hit the deck, covering his head. Chunks of concrete rattled past. When he looked up, the tunnel behind them was a wall of rubble and rebar. The hatch they'd come through was gone, buried under a ton of collapsed ceiling.

"Trap," Camille said, dusting herself off with a calm that didn't reach her eyes. "You called it."

"We're sealed off." Mercer stood, testing his legs. "They didn't want us going back. They want us moving forward."

"Or they want us dead in here." Camille swept her light across the collapse. "Small charge. Fifty grams, maybe less. Meant to block, not kill." She paused. "Someone knows we're not the main threat. They're herding us."

"Herding us where?"

She turned and started walking down the passage—toward the branch, toward the ladder, toward whatever waited. "The only way left."

Mercer caught up to her in three strides. "You're too eager to run into this."

"I'm not eager. I'm out of options." She didn't slow. "The train's sealed. The tunnel behind us is sealed. The only way out is through."

"And if that's exactly what they want?"

She stopped. Turned. For a moment, the dim light caught her face, and Mercer saw something beneath the professional mask—a flicker of the woman who had lost her people in Prague, who had carried that weight across borders and years.

"If it is," she said, "then the alternative is sitting here and waiting for the next charge to find us. I don't know about you, but I didn't crawl through a maintenance shaft and climb onto the roof of a train at eighty miles an hour to die in a concrete pipe."

She walked on.

The branch came up fast. Straight ahead, the passage continued into deeper darkness. To the right, the service ladder climbed toward a steel hatch marked with stenciled French: ACCÈS MAINTENANCE—NIVEAU 4.

Camille looked at the ladder. Then at the dark passage.

Mercer read her hesitation. "Which one?"

"The ladder leads to the train. We already know what's up there—Fournier's men, Sokolov somewhere in the dark, and a biological agent that could kill half of London if we're wrong." She nodded toward the passage. "This leads forward. Toward the breach point. Toward whoever's been pulling strings."

"That's also where the trap is."

"Everything's a trap, Mercer." She started toward the ladder. "But the trap on the train is one we've already seen."

"Wait." Mercer grabbed her arm. She tensed but didn't pull away. "You said you knew Sokolov from Prague. You said your contacts died. What you didn't say—" He paused. "What you didn't say is whether he knew your father."

Camille's expression went very still. The penlight in her hand didn't waver.

"Your father isn't the only one Sokolov knew," she said quietly. "He knew mine too. They worked together, once. Before my father disappeared. Before Prague." She pulled her arm free. "That's what I haven't told you. That's what I've been carrying since I found that paper."

Mercer's chest tightened. "Your father—"

"Is dead. Or as good as. Sokolov was the one who told me." She turned back to the ladder, her voice flat. "He was the one who killed him."

She climbed. Mercer stood at the base, watching her boots disappear through the hatch, and realized the ground beneath him was vibrating again. Not a charge this time—something rhythmic. Mechanical.

He grabbed the ladder and climbed after her.

The hatch opened onto a narrow maintenance platform that ran along the side of the train. The service spur was a cavernous space, lit by sodium lamps that cast everything in amber gloom. The train sat motionless below them, its rear carriage visible a hundred yards ahead, its maintenance hatch standing open.

Camille was already moving along the platform, toward the rear.

"Camille," Mercer called, keeping his voice low. "The vibration. Something's coming."

She paused, looking back. "What kind of something?"

He didn't get to answer. A dull roar rolled through the spur, and the far end of the platform—thirty feet ahead of Camille—erupted in a sheet of flame and steel. The blast wave knocked her off her feet, sent her rolling toward the edge, and Mercer lunged, catching her arm as her boots scraped over the drop.

He hauled her back onto the platform. She was bleeding from a cut above her eyebrow, her eyes wide.

"That," she said. "That kind of something."

Mercer looked toward the rear of the train. The platform was gone—collapsed into a twisted mass of metal and fire. Behind them, the hatch they'd come through was still intact, but the ladder shaft below was already filling with smoke.

They were trapped on a narrow ledge, with a burning gap ahead and a dead end behind.

"Next access point," Camille said, her voice tight. "There has to be one. The maintenance plan I saw—there were service doors every forty meters."

"Between us and the breach?"

She counted in her head. "Three doors. But if they've sealed the others the way they sealed this one—"

"Then we find out how fast we can run." Mercer grabbed her hand and pulled her along the platform, away from the flames. "Go."

He didn't look back. He could feel the heat at his back, feel the smoke thickening, but ahead, maybe thirty yards away, he saw it: a steel door, still intact, marked with the same stenciled French.

Camille saw it too. She broke into a sprint.

Behind them, the fire found something flammable and roared. Mercer pushed harder, his lungs burning, and reached the door a half-second behind Camille. She grabbed the handle and pulled.

It didn't move.

"Locked," she said, and her voice was too calm, too controlled. "It's locked."