Chapter 1 - The Threshold of Steel

The flight deck door clicked shut behind Dr. Maya Lin, sealing off the hushed murmurs of the cabin. The transition was immediate: from the soft, insulated carpet of row eight to the harsh, sterile glow of instrument consoles humming against high-altitude turbulence.
The air in the cockpit smelled sharply of ionized copper, burnt wiring, and cold sweat.
"Captain?" the flight attendant whispered, her voice trembling. "I brought her."
Captain Thomas Vance did not look over his shoulder immediately. His knuckles were bone-white against the yoke of the Boeing 777-200ER. Next to him, First Officer Davies was slumped forward in the right-hand seat, unconscious, his chin resting against his chest, restrained only by his four-point shoulder harness. Davies’s face was clammy and pale, an oxygen mask askew over his mouth.
"Air Force?" Vance’s voice was cracked, raspy. He turned slightly, revealing eyes ringed with exhaustion and a deep, blooming purple bruise across his temple. "What’s your airframe?"
"Vipers," Maya said, her posture stiffening instinctively. The domestic gentleness she wore in seat 8A dissolved. Her chin came up, her shoulders squared, and her voice dropped an octave into the flat, unhurried cadence of a flight lead. "F-16C Fighting Falcon. Three tours, 421st Fighter Squadron. Twelve hundred flight hours. Then test pilot at Edwards."
Vance exhaled, a ragged sound. "Can you fly heavy transport?"
"The physics are the same, Captain. Mass, thrust, lift, and drag. What happened here?"
"Davies suffered an acute seizure twenty minutes ago—medical emergency. When he collapsed, he struck the flight management console, dislodging our circuit panel casing. We hit severe clear-air turbulence at the same moment. The primary avionics bus shorted out. Autopilot is dead. Flight director is dead. Our primary attitude directors are cycling into endless reboot loops." Vance coughed, clutching his left side where his flight vest was pinned tight. "I broke two ribs trying to keep us out of an inverted slip. I’m losing sensation in my left arm. Vasovagal syncope or a coronary event. If I pass out, three hundred and twelve souls go into the ocean at Mach 0.84."
Maya stepped into the cockpit jumpseat, leaning between the two men. Her eyes swept over the cockpit displays. The multi-function displays (MFDs) were flickering like dying neon. The artificial horizon was frozen at a three-degree pitch-up, but the mechanical standby gauge—the small, vacuum-driven sphere below the main glare shield—showed a five-degree nose-down descent with an eight-degree right bank.
"You're in a graveyard spiral," Maya said calmly. "The main displays are lying to you."
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"I know," Vance whispered. "My instruments say one thing, the standby says another. My vertigo is getting worse. Take Davies out of that seat."
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