Read Chapter 15: The Fuse

The vent grille came away with a screech of tortured metal, and dust showered Élise's face. She blinked it out, coughed, and peered into the black rectangle Alfred had just exposed. The maintenance shaft was narrow, barely shoulder-width, and the darkness swallowed the beam of her penlight after six feet.

"He went in here," she said. "Barefoot, which means he shed the boots somewhere, which means he's lighter on his feet than he looks. He knows this train better than we do."

Alfred wiped his palms on his trousers. His face was still pale from the confession in the crawlspace, and the tremor in his hands hadn't fully stopped. "I've been in these vents maybe twice in eleven years. They're not for people. They're for wiring and condensation lines."

"And yet he's in them."

"Or he was." Alfred took the light from her hand and ducked into the opening. "Hold my belt. If I drop, I want somebody to know which way I fell."

Élise grabbed the loop of his uniform trousers and watched his legs disappear. His shoes scraped against aluminum ductwork, then the sound changed—a hollow knock, then a soft curse.

"There's a junction here. Three ways." His voice came back muffled, metallic. "Left goes over the galley. Right stays along the car's spine. Straight up—that's the plenum above the passenger ceiling. No way he'd fit in that."

"Which one stinks?"

A pause. "All of them."

"Use your nose, not your ears. A dead animal has a different smell than a dead man. And a hidden space has a different draft than an open one."

More shuffling. Élise's hand cramped in the belt loop. She counted seconds to keep her breathing even—thirty, then sixty, then ninety—before Alfred's voice came back, tight and strange.

"There's a panel. It's not riveted like the others. It's got hinges on the underside."

"Hinges?"

"Yeah. Someone built a door."

"Don't open it."

But she heard the click of a latch, the groan of a seal giving way, and then Alfred's sharp inhale. The silence that followed was worse than any scream.

"Alfred."

Nothing.

"Alfred, what is it?"

When he spoke, his voice had dropped an octave. "There's a body in here. Not Antoine."

Élise released the belt and shoved herself into the vent. The ductwork bit into her knees and elbows as she scrambled forward, following the small circle of light ahead. Alfred had wedged himself into the junction, one arm braced against the wall, his other hand holding a panel open. His face was the color of old paper.

She squeezed in beside him and looked.

The compartment was a custom fit, foam-lined, the kind of space built for smuggling something valuable across a border. It held a corpse folded into a sitting position, knees to chest, arms crossed. The man wore a full hazmat suit, the visor of the hood still sealed. A dark flower of dried blood had bloomed on the chest of the suit—one bullet wound, clean and professional.

"Who is he?" Élise whispered.

Alfred shook his head slowly. "I don't recognize the suit. Not SNCF, not Eurostar security."

Élise reached past him and tugged at a Velcro pocket on the body's upper arm. It came open with a ripping sound. Inside was a laminated ID card, stiff with dried blood. The photo showed a square-jawed man in his forties, crew cut, no smile.

The badge read: *DUPONT, MARC. DGSI—Unité 7. Special Clearance Level 4.*

"French intelligence," Élise said. The words felt like glass in her mouth. "Domestic security. They have a unit inside the tunnel?"

Alfred's jaw worked. "Not that I've ever seen."

"Check his hands."

Alfred pulled on a pair of nitrile gloves from his pocket and lifted one of the corpse's arms. The hand was gloved, fingers curled. But the suit's cuff had been pulled back slightly, revealing pale skin.

"No rash. No lesions." Alfred looked at her. "He didn't have the plague."

"And he wasn't killed by whoever's sick, either. One clean shot through the heart." Élise's mind was racing, rewiring everything she thought she knew. "He found this compartment, or Antoine found him first, or—"

"Or he was guarding it." Alfred's voice had gone flat. "And someone put him in here to keep the secret."

Élise took the penlight from Alfred and swept it over the compartment's interior. Behind the corpse's shoulder, the foam lining had been carved out to fit something longer than a man's hand. A rectangular imprint, about the size of a laptop case.

"Something was stored here," she said. "And moved out."

"The lab coat wasn't enough," Alfred said. "You needed proof of something bigger."

Élise ignored him. She reached into the compartment, past the corpse's visor, and found a second Velcro pocket on the man's thigh. Inside was a portable satellite phone, powered off, its battery pack sticky with dried adhesive. She pulled it out and turned it over.

On the back, scratched into the plastic, was a crude numeric code: 77-CH-4-V.

The same transport number as the ampoule.

"Alfred." Her voice came out thin. "This wasn't just a delivery. This was a swap."

"A swap for what?"

She turned the phone over in her hands. "Somebody put this man in here with a direct line to a satellite. And whoever killed him didn't want that line found. But they didn't search the body. They just sealed the compartment and walked away."

"Or crawled away." Alfred shifted, pulling himself backward toward the vent opening. "We need to get out of here. If somebody sees us—"

"Alfred, listen to me." Élise grabbed his wrist. "The DGSI doesn't run secret quarantine operations. They run intelligence. Domestically. Which means the French government knew the pathogen was coming onto this train."

"You don't know that."

"I know this body is in a hazmat suit that cost a thousand euros." She held up the ID badge. "I know the man who killed him was barefoot and moved through a crawlspace most people don't know exists. And I know that whatever was in that compartment, it wasn't Antoine. He was the courier. This man was the security."

"So who's the architect?"

The question hung in the stale air. Élise thought about Renaud's measured voice, his calm escalating of a hostage situation into a shooting, his careful fingers steering every decision toward his own outcome.

Then Alfred's radio crackled on his belt. A tinny voice came through, barely audible. The voice was calm, familiar.

"—repeat, Dr. Fournier is needed in Car 4. The forum is about to begin. Dr. Fournier, please report to the platform at once."

Renaud.

Élise looked at the corpse, then at Alfred. She tucked the satellite phone into her jacket and pulled herself backward out of the vent, her mind already rearranging the pieces: the engineered vials, the VÉRITÉ ampoule, the hazmat corpseman, the scheduled forum that Renaud insisted she attend.

"He's not running the quarantine," she said softly. "He's running the test."

Alfred followed her out, his face a mask of dread, his trembling hand making the vent grille rattle as he fixed it back into place.