Chapter 4 - The Vault Under the Lake

The words hung in the air of the first-class cabin like a thunderclap.
Dr. Catherine is waiting.
Nathan gripped the edge of the leather seat, his knuckles turning chalk-white. "She’s alive? Lily, tell me the truth—is Catherine alive?"
"She was sleeping when they took her," Lily said, her eyes wide and honest. "She took a special medicine that made her heart slow down so the machines couldn't read her brain. She told me she would wake up when the key was put into the terminal."
Sarah gasped, holding her hand over her mouth. "Lily, why didn't you tell me this before?"
"Dr. Catherine made me promise," Lily said softly, looking down at her shoes. "She said if I told anyone before I met her babies, the bad men would find her first."
Nathan stood up, his mind racing at lightspeed. Everything made sense now. Catherine hadn't abandoned them. She had been targeted by Vanguard Bio-Tech, who wanted her revolutionary neural interface technology. Realizing she was trapped, Catherine had faked her own brain-death or physical disappearance, putting herself into a medically induced stasis inside an off-grid facility, leaving the decryption key hidden inside the neural memory of a child she had saved.
It was brilliant. It was insane. It was pure Catherine.
Suddenly, the airplane’s cabin lights flashed bright red. The loud chime of the emergency alarm blared through the speakers.
"Ladies and gentlemen, this is the captain speaking," a tense voice crackled over the PA system. "We are experiencing a minor electrical issue and will be making an unscheduled diversion to a private airfield outside of Minneapolis. Please remain in your seats with your seatbelts fastened."
Nathan’s heart plummeted. An unscheduled landing.
He rushed to the window, looking out at the thick cloud cover below. Vanguard controlled several private regional airfields in the Midwest. They didn't just have operatives on the plane; they had compromised the flight path itself.
"They're taking the plane," Nathan realization struck him like a physical blow. "The pilots are working for Vanguard, or they've been forced to divert."
A sharp knock sounded on the sliding door of the first-class suite.
"Mr. Wells," Melissa’s voice sounded desperate from the other side. "They're coming through the curtain. They have guns!"
Before Nathan could unlatch the door, a muffled pop echoed through the cabin—the unmistakable sound of a silenced firearm hitting the electronic door lock. The door burst inward, splintering off its tracks.
The silver-haired man stepped into the suite, holding a suppressed pistol. Behind him stood his broad-shouldered partner, holding a heavy black duffel bag.
"End of the line, Mr. Wells," the silver-haired man sneered, aiming the weapon directly at Nathan’s chest. "We’ll take the child and the notebook now. As for you and the infants... accidents happen during emergency landings."
Sarah shrieked, pulling Lily behind her. Emma and Ethan began to cry—not the soft whimpering of normal babies, but the loud, piercing wail that had filled the cabin earlier.
"You don't want to do this, Vance," Nathan said, taking a subtle step to shield Sarah and the kids, recognizing the silver-haired operative from a corporate intelligence dossier he had read months ago. "Neurosoft satellite trackers are locked onto my personal biometrics. The moment my heart stops, federal authorities will storm every Vanguard facility in North America."
Vance laughed coldly. "Your biometrics are already being jammed, Nathan. As far as the FAA knows, this plane is experiencing total avionics failure. Hand over the girl."
Vance stepped forward, reaching out a hand to grab Lily’s arm.
In that instant, Lily didn't scream. She didn't cower.
She opened her mouth and began to sing again—louder, sharper, her voice hitting a precise, high-pitched pitch that resonated oddly against the airplane’s composite walls.
Hush little babies, don't say a word...
The moment the specific frequency echoed through the small space, the broad-shouldered man carrying the briefcase suddenly gasped, grabbing his head in agony. The silver-haired man staggered, his pistol dipping as his eyes rolled back, a high-pitched ring whistling out from his ear-comm piece.
It wasn't magic. It was acoustic neural feedback.
Catherine had programmed Lily’s voice to trigger an acoustic resonance frequency that overwhelmed standard military-grade earpieces and neural implants—the very implants Vanguard operatives used for tactical communication.
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"NOW!" Nathan roared.
Nathan lunged forward, slamming his full body weight into Vance, driving him back into the hallway.