Read Chapter 27: The Message

The sub-basement air was cold and stale, tasting of dust and the metallic tang of old blood. Camille knelt on the cracked concrete, the taped scrap of paper resting in a clear plastic evidence baggie Victor had produced from his pack. Her hands trembled slightly, not from fear but from the cold that seeped through her knees.

“The coordinates aren’t complete,” she said, turning the bag over. “It’s a base-ten grid, but there are three digits missing.”

Julien crouched beside her, his headlamp cutting a blade of white through the gloom. He peered at the hand-scrawled numbers and letters Marc had left, written in a code of his own making. “Maybe it’s not missing. Maybe it’s hidden.”

Léa, pathetic and pale behind them, leaned against a concrete pillar, her arm swathed in clean bandages. The wound beneath was an angry red, and the smell of decay was already starting to fight its way past the antiseptic. “Marc was paranoid. He used to hide things in plain sight. Numbers within other numbers.”

Victor took the bag, his thick-gloved fingers surprisingly gentle. “Look at the pattern of the blood. Some of these digits were written after the tape was applied. They overlap it. Those are the ones that matter.”

Camille looked closer. The blood was dark, flaking. Seven digits were scored over the edge of the tape’s residual edge, the script shakier, the pressure harder. The original nine digits corresponded to the old air traffic control grid for the city, but these seven—they formed a different pattern. A more specific one.

She pulled a stub of pencil and the back of a prescription pad from her coat. She scratched the numbers out, her pharmacist’s brain automatically looking for a pattern, a key. Nothing. Julien watched over her shoulder, his breath fogging.

“Try the inverse,” he said. “The grid on the tape is for surface level. What if he used the negative space?”

She flipped the pad, writing in reverse, reading the numbers from right to left. It was clumsy, but in the inversion, a new sequence emerged. A latitude and longitude—but not for the tower’s street-level address. It was deeper. Sub-basement 2. A service vault.

“It’s not beneath Montparnasse,” she whispered, the thrill of discovery cutting through the exhaustion. “It’s inside the access tunnel beneath the old rail line. It’s a survivor bunker. A shelter built for the city’s transport brass during the Cold War.”

Victor’s eyes narrowed. “Marc knew about it. And whoever killed him didn’t.”

“They killed him because he hid the chip, not because he knew about the bunker,” Julien said. “The location was his message. His last will.”

Léa pushed herself up, wincing. “So we go. Now. Before they seal the perimeter.”

Camille helped her steady. Victor looked across at a man and woman from the fourth floor who had helped lug the medical supplies down—healers and a mechanic, the two survivors who seemed most capable of moving in the dark. “We need to move fast. Small team. Four, maybe five. Anyone more and we’ll be tracked.”

Julien’s jaw tightened. “Saint-Vincent still holds the key to the chip. If we go to Montparnasse first, we can decode it there, better, faster. The backup tower might have the mainframe access we need to bypass the blind code.”

The fourth-floor man, Simon, stepped forward. “But the convoy is coming from the north,” he said. “Heading to Montparnasse means crossing their path. It’s suicide.”

“It’s our only option,” Camille said, and her voice carried the weight of the decision. “If we split up, the radio and the chip stay separate. We go together—but quiet. A few hours south. We can make it through the tunnels.”

Victor raised a hand. “Then it’s agreed. Four of us go. Camille, Julien, myself, and Léa. The rest of you hold the building. Barricade every entrance. If the mercenaries come, you hide. Don’t fight.”

The group murmured assent. Simon visibly stiffened, annoyed at being left, but he nodded. “We’ll keep the block alive.”

Camille looked at the seven-digit string on the paper. The message wanted them to go underground, into a forgotten bunker where the old world’s failsafes might still hum with a current they’d thought lost. The decision felt raw, like a nerve being pinched, but there was no other path. The coup in the sky had already sentenced Paris. If they wanted to wake it, they had to go down.

She pocketed the paper and stood. The word was out. The plan was set.