The service entrance of Shenjing Neural Systems was a concrete throat lined with flickering fluorescent tubes, leading downward into the building's sublevels rather than up toward its glass tower. Leon pressed himself against the cold wall and watched the security booth through a gap in the stacked pallets. Inside the booth, two guards were performing the ritual of shift change—coffee exchanged, status reports recited, holstered weapons adjusted. The clock on Leon's phone read 01:58.
Thirteen minutes until the window opened. Seventeen minutes to get in, find the patient-zero data, and get out. After that, the new shift would complete its first patrol rotation and discover the anomalies he would inevitably leave behind.
The keycard Shen Li had given him was unmarked white plastic, no logo, no magnetic strip—just a faint embedded chip visible when held against light. It looked homemade, or at least not mass-produced. Leon turned it over in his palm, weighing the probability that it was a trap against the certainty that he had no other way in.
At 02:00 precisely, the guards in the booth stood simultaneously. One stretched, cracking his neck. The other reached for a jacket hanging on the back of the chair. They exchanged a few words that Leon couldn't hear through the glass, and then they walked out of the booth together, heading toward the elevators that led to the staff locker rooms four floors up.
The window was open.
Leon crossed the loading bay in twelve silent strides. The keycard reader beside the service door was a standard model, but when he held the white card against it, the reader beeped twice and displayed a message in crisp green text: "Temporary Access: Level 3 Clearance. Duration: 17 Minutes. Begin."
The door unlocked with a pneumatic hiss. Leon slipped inside.
The corridor beyond was antiseptic white, lined with closed doors and the kind of absolute silence that only existed in buildings where something important was being hidden. A digital floor plan materialized on a wall-mounted screen as he approached, triggered by his keycard's signal. The server room was on Sublevel 3, three floors down, accessible through a central stairwell or a dedicated service elevator. The elevator required biometric authentication. The stairwell required only the keycard.
Leon took the stairs.
Sublevel 1 was administrative—offices, conference rooms, a cafeteria dark and empty. Sublevel 2 was laboratory space, visible through internal windows that revealed rows of gleaming equipment shrouded in plastic dust covers. But Sublevel 3 was different. The stairwell door opened onto a single corridor that ended in a massive circular door, like a bank vault, its surface etched with circuitry patterns that glowed faintly blue.
The patient-zero server.
Leon approached the door and pressed the keycard against the reader. The same beep, the same green text, but this time with an additional message: "Genetic authentication required. Please provide sample."
He pulled out the sealed bag containing the cotton swab from Cao Yichen's pendant. The touch plate beside the door was a smooth black panel, cold to the touch. Leon pressed the swab against it, rolling the cotton across the surface to deposit as many cells as possible. The plate warmed slightly, analyzing. Five seconds passed. Ten.
The door remained locked.
Leon felt his pulse accelerate. The sample was supposed to work. The pendant had been against Cao Yichen's skin for hours, absorbing sweat and epithelial cells in quantities that should have far exceeded the ten-thousand-cell threshold. Unless the security system required something more specific—a particular cell type, a particular concentration, a particular freshness that the swab had lost during transport.
He tried again, pressing the swab harder against the plate. Nothing.
The countdown timer on his phone showed 55:31:12. The seventeen-minute window was now eleven minutes. And standing in this corridor with a locked door and a failing sample was exactly the kind of vulnerability that traps were designed to exploit.
Leon forced himself to think. The pendant. Not just the surface cells, but the pendant itself. The compartment inside it, the capsule, the crystalline powder. His grandmother's stories about Cao Cao's jade pendant had mentioned medicine, but what if the powder wasn't medicine at all? What if it was a long-term storage medium for genetic material, preserved in a crystalline matrix that could survive for decades or centuries?
He pulled out the pendant and unscrewed the gold cap with trembling fingers. The capsule gleamed under the corridor's blue light. Leon hesitated for three seconds, then crushed the capsule between his fingers.
The powder spilled onto the touch plate, and the reaction was immediate. The plate blazed with light, the circuitry on the vault door flared from blue to gold, and the massive locking mechanism disengaged with a sound like a sword being drawn from a stone scabbard.
The door swung open.
Beyond it was not a server room. Not in any conventional sense.
The chamber was circular, thirty meters in diameter, its walls lined with vertical tanks of clear fluid in which floated what Leon could only describe as organic processors—living neural tissue, cultured and sustained, threaded with fiber-optic filaments that pulsed with slow, rhythmic light. The tanks were arranged in concentric circles around a central console, and the fluid in each tank was tinted a different shade of amber, from pale honey to deep mahogany.
A single monitor glowed on the central console. Leon walked toward it, his footsteps echoing on the metal grating, and saw that it was running a command-line interface. The prompt was blinking patiently: "ENTER PATIENT-ZERO ACCESS CREDENTIALS."
He had no credentials. But the keycard was still in his hand, and he pressed it against the console's reader out of desperation.
The screen flickered. A new message appeared: "HUA BLOODLINE DETECTED. ANCESTRAL ACCESS GRANTED. DOWNLOADING PATIENT-ZERO ARCHIVE."
The data began streaming onto the screen in cascading columns—not just medical records, but complete neural mappings, synapse-by-synapse reconstructions of brain activity, genetic sequences annotated with surgical diagrams that combined modern neuroanatomy with ancient meridian charts. Leon recognized the hybrid language immediately. It was the same fusion of classical Chinese medicine and modern computer science that his grandfather had spoken of in the video, the same synthesis that Leon himself had spent his academic career attempting to achieve.
And then he saw the name at the top of the first file.
HUA TUO. Patient Zero. Date of Mapping: 208 AD.
Leon stopped breathing.
The file was a complete neural scan of Hua Tuo himself, performed two thousand years ago, preserved in a format that had been translated across generations of storage media—from silk scrolls to magnetic tape to optical disc to the living neural tissue floating in the tanks around him. The Qing Nang Code wasn't just a collection of medical knowledge. It was a human mind, digitized and stored, waiting for a body to inhabit.
A new message appeared on the screen, not from the console but from the same peer-to-peer protocol that had delivered his grandfather's video: "Congratulations on completing Item One. You now possess the original neural map of Hua Tuo. Item Two will commence in twelve hours. Required action: implantation."
Leon stared at the word. Implantation. The list's second item was not another theft or extraction. It was a surgical procedure. He was supposed to implant the neural map into a living human brain, and the only brain in this facility that matched the ancestral access credentials was his own.
The console screen split into two windows. On the left, the patient-zero data continued streaming. On the right, a new countdown appeared: 12:00:00. Beneath it, a surgical instruction manual rendered in the same calligraphic style as the first message, detailing a procedure that would permanently alter the architecture of his brain.
"The Hua Tuo Protocol," the manual began, "enables the host to access the complete medical knowledge of the ancestral line. Survival rate: 47%. Side effects include permanent personality integration, memory displacement, and potential loss of discrete self-identity."
Leon backed away from the console, his hand pressed against his chest where the acupuncture needles still rested. He had expected to steal data. He had not expected to be asked to surrender his own mind.
The living neural tissue in the tanks pulsed faster now, as if sensing his proximity. The fiber-optic filaments brightened, casting shifting patterns on the ceiling. And somewhere in the digital architecture of the Divine Surgeon, the ghost of Hua Tuo was waiting for an answer that Leon was not ready to give.
The corridor behind him was still empty. The window was still open. But as Leon turned to leave, he saw that the vault door had swung shut, and the locking mechanism was glowing gold again, sealing him inside the chamber until he made his choice.
The countdown on his phone showed 54:44:02. The countdown on the console showed 11:58:17.
He was trapped, alone, in a room full of living memories, with a decision that would either destroy him or transform him into something the world had not seen for two thousand years.
And then the lights went out.
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