Read Chapter 5: The Third Passenger

The train shuddered—not the usual rhythmic rock of the rails, but a long, metallic groan that traveled up through the floor and into Mercer's teeth. Outside the window, the black of the Chunnel tunnel wall began to slow. Then, with a hiss of hydraulics, the brake pressure changed, and the Eurostar began to decelerate.

The conductor's voice crackled over the PA, smooth and apologetic. "Good evening, ladies and gentlemen. Due to technical issues, we will be making an unscheduled stop shortly. Further updates will follow. We apologize for the inconvenience."

Mercer was already moving, his hand brushing Camille's elbow as he steered them away from the luggage car door and into the narrow corridor. "Technical issues."

Camille's eyes were hard, scanning the empty corridor ahead. "The tunnel is sealed. There are no emergency stopping points in the middle of the Channel. That was not a technical decision."

"Then somebody made it look like one." Mercer pressed his palm flat against the window. The train was still moving, but barely—ten, maybe fifteen kilometres an hour. He could see the tunnel wall slowly sliding past, the occasional service hatch blinking by like a missed heartbeat.

"A stop gives whoever took Vernet a chance to move her," he said. "She doesn't leave this train at Folkestone, and she doesn't leave at Calais-Fréthun. But somewhere in between?"

Camille pulled her phone from her pocket, tapped it, and frowned. "No signal. They're jamming—or the tunnel is doing it naturally." She pocketed the device, her jaw tight. "We should find the driver's cabin. Control the train, control the extraction."

Mercer nodded, but a knot had already formed in his gut. He thought of the cufflinks, the queen of hearts in his jacket pocket, the dead attendant Renard. Someone was herding them. Every step they took, a fresh breadcrumb led them deeper.

"I'll take the rear," he said. "You go forward, find the control room. If anyone tries to stop you—"

"I know how to handle myself, Mercer." She was already walking, her heels clicking with an efficiency that suggested she'd memorized the train's layout decades ago. She paused at the next carriage junction, one hand on the door, and looked back over her shoulder.

"Don't vanish on me," she said. "Not like she did."

The door slid shut behind her before he could answer.

Mercer moved in the opposite direction, back toward the luggage car where Renard's body lay. He needed to check the service hatches—those access panels along the carriage floors that maintenance crews used. If someone knew the train's anatomy, they could slip Vernet into the underfloor cavity and keep her there until everyone disembarked. But with the train decelerating, they'd have less time. An unscheduled stop meant the platform authorities would be called, and Vernet would never reach the French side as a prisoner.

He reached the luggage car door and pulled it open.

The air hit him first—colder, stale, with the faint metallic tang of blood. Renard's body was still there, sprawled behind the luggage racks where they'd found him. No movement. No one had come back.

Except—Mercer froze, his hand sliding under his jacket to rest on the grip of his Sig Sauer.

A sound. Soft, rhythmic. Breathing.

He edged around a stack of wheeled suitcases, his eyes adjusting to the dim light. There, crouched in the corner between the wall and a steel maintenance cabinet, was a man. He was young, maybe mid-twenties, with the rumpled navy uniform of a train attendant—but the jacket was too big for him. The sleeves bunched at his wrists. And his hands were shaking.

"Please," the man whispered, holding up a palm. "Don't. Please."

Mercer didn't lower his weapon—his hand stayed on the grip, but he didn't draw. "Who are you?"

"Henri. Henri Lefèvre." The man's voice cracked. "I'm the attendant. The real one. They took my uniform."

Mercer's mind raced. *Renard's body was the attendant. But this man says he's the attendant.* A third player. Third passenger, third uniform. The train was a deck of cards, and somebody had been dealing for hours.

"Your uniform was found on a dead man," Mercer said, keeping his voice even. "You want to explain that?"

Lefèvre swallowed hard, his Adam's apple bobbing. "They came for me in the service corridor. Two of them. Big man, and a woman with a scar on her cheek." His eyes darted toward Renard's body, and he flinched. "They'd already killed Renard. Used his keycard to get into the first-class compartments. They wanted mine for the cargo hold."

"Cargo hold?"

"The underfloor compartments. They were going to put someone in there. A passenger. They said she'd be easy to move if the train stopped."

Mercer took a step closer. "Did they say where they were taking her?"

"No. But they had a case." Lefèvre's voice dropped to a whisper. "Silver. About this long." He held his hands about a foot apart. "It had a clasp on it—like the ones they use for transporting live tissue. I saw a doctor once with one on a train to Geneva. They put, you know, organs in those. Or blood."

Mercer's throat tightened. The window seal in Vernet's compartment—tampered with from inside. A dispersal agent. A gas. Now a biological container.

"Where is the case now?" he asked.

"I don't know. They hit me, threw me in here." Lefèvre gestured at the maintenance cabinet. "I woke up when the train started slowing."

The train gave another shudder, harder this time. Outside, the tunnel lights flickered, and the rhythm of the wheels changed—slower, grinding. The Eurostar was coming to a full stop.

Mercer crouched to the man's level. "Listen carefully. You stay here. Do not move. Do not call anyone—your radio won't work, and anyone who answers might be them. Understood?"

Lefèvre nodded frantically.

Mercer turned away and pulled out his phone. No signal. He tried the emergency text channel—nothing. He was alone in the rear half of the train, with a dead attendant, a live one hiding in a corner, and a cargo hold that might now be a mobile morgue.

He was halfway to the next carriage when he heard the scream.

It came from the front of the train—high and sharp, swallowed almost immediately by the sound of the hydraulics. But Mercer had heard enough screams in his career to know this wasn't a passenger panicking about a delay. This was someone who'd been hurt.

He broke into a run, vaulting over a stray suitcase and shoving through the carriage door.

The corridor ahead was empty. The seats on either side were occupied by passengers who all stared at him with wide, frightened eyes—not at him, he realized. Past him. Behind him.

He spun.

Standing in the junction between carriages, silhouetted against the emergency light, was a man Mercer hadn't seen before. Tall, broad-shouldered, wearing an immaculate black suit. His face was partially in shadow, but the light caught the sleeve and glinted off something silver.

A cufflink.

The man smiled—a thin, unkind line—and raised a hand. In it, he held Camille's phone.

"Agent Mercer," he said, his accent Eastern European, measured. "I believe you're looking for this."

Mercer's hand went to his Sig, but the man was already stepping back, the door hissing shut between them.

Through the glass, Mercer saw the man turn and walk away. Then he saw the phone drop to the floor, its screen cracked, the home screen displaying a single word:

*SOKOLOV.*

The train lurched to a full stop. Lights dimmed. A dead silence fell over the carriage.

Mercer was hammering on the door release when he realized his own pocket held two silver cufflinks—his and the one from Vernet's compartment. But this man had been wearing a matching pair.

A third cufflink. A third passenger. He'd been on the train since Calais.

And he had Camille.