A billionaire offered ten million dollars to anyone who could decode an ancient journal after the world's best experts admitted defeat. They laughed when a fourteen-year-old waitress stepped forward with a serving tray in her hands—until my very first translation exposed a secret that made the billionaire realize he'd been searching for the wrong person all along.

The unmarked helicopter touched down on a concrete helipad nestled deep within a dense pine forest in the Adirondack Mountains, the rotor wash whipping the dark evergreens into a frenzy of flying snow and pine needles.

It was 4:00 a.m. The mountain air was freezing, biting through my thin black server uniform and the wool jacket Russo had tossed over my shoulders during the boat ride up the Hudson.

We stepped out of the cabin, ducking beneath the slowing blades, and hurried toward a heavy steel blast door set directly into the granite side of the mountain. The entrance was disguised to look like an abandoned mining shaft from the late nineteenth century, complete with a rusted iron cart rail and rotting timber beams.

Russo punched a numeric code into a weather-beaten keypad hidden behind a loose boulder, then pressed his right palm against a biometric scanner that glowed with a faint blue light.

Click-hiss.

The heavy steel door swung inward, revealing a brightly lit, sterile subterranean corridor lined with brushed aluminum panels and high-tech environmental controls. It looked less like a mountain hideout and more like a NASA control room buried beneath a mile of solid rock.

"In here," Russo said, leading me down the corridor into a circular chamber dominated by a massive circular table made of reinforced glass and steel.

In the center of the table rested a cradle of padded velvet—the exact size and shape of the ancient journal I was carrying.

I walked up to the table and gently laid the Codex of the Iron Threshold into the cradle. The heavy calfskin binding settled into the velvet with a soft, settling sigh.

"This is it," Russo said, walking over to a wall console and tapping a sequence of keys. "The primary decryption rig. Your father helped me design the optical scanners back in 2010. But the machine could never read the script because it lacked the human variable."

"What human variable?" I asked, stepping back from the glass table.

Russo turned around, holding a small, sterile lancet in his hand. He didn't look threatening; his expression was completely calm, almost clinical.

"Your blood, Olivia," Russo said quietly. "The final line of the cipher isn't read with an eye or translated with a dictionary. It’s a genetic lock. The ink your father used to annotate the margins—the ink he used when he translated the final pages—was mixed with a specific rare-earth isotope that only reacts to the bloodline of the primary author."

I stared at the lancet in his hand, then down at my own fingers.

"You want me to bleed on the book?"

"I want you to open it," Russo corrected. "Because the Syndicate isn't just tracking us through Manhattan. Their satellite uplink picked up our transponder when we crossed the county line twenty minutes ago. They’ll be at the surface entrance before sunrise."

Panic spiked in my chest. "Then why are we wasting time? Let's run!"

"We can't run anymore," Russo said, his voice dropping into a tone of absolute, unbreakable finality. "The vault has a terminal lockdown mechanism. Once the outer blast doors are breached, this facility seals permanently from the inside. Either we unlock the vault’s primary core using the journal, or we spend the rest of our lives buried alive."

He stepped forward and held out the sterile lancet.

I looked at the silver needle, then at the ancient journal that had cost my father his life. All my life, I had tried to stay invisible. I had tried to be the girl who carried the tray, the shadow in the corner, the invisible help who nobody remembered.

But standing here in the heart of the mountain, with the ghosts of my father and a dead billionaire's daughter watching from the dark, I realized that invisibility was just another word for hiding.

I took the lancet from Russo’s hand.

Without hesitating, I pressed the metal tip against the pad of my left index finger and clicked the release. A sharp pinch, a bead of dark red blood welled up against the skin.

I stepped up to the glass table, pressed my bleeding finger directly against the third symbol on the warped calfskin page—the symbol of the waiting blood.