Now she couldn't stop noticing.
She arrived at 6:47 AM, earlier than usual. The parking lot held only three cars: hers, the overnight security guard's, and Dr. Yoshida's. He was always here early. Yuna wondered if he ever went home.
The lab was cold. Motion-sensor lights flickered on as she walked the corridor, her footsteps echoing against tile. Through the windows, the ocean was dark blue, almost black, the sun not yet clearing the eastern hills.
At her workstation, Yuna set down her coffee and powered on the monitors. The Z-0 biosignal window from yesterday was gone. She'd expected that. Whoever was watching wouldn't leave evidence sitting on her screen for long.
But Rose would remember.
"Rose, yesterday's Z-0 monitoring data. Do you still have it cached?"
"Affirmative. Cached data persists for seventy-two hours unless manually purged."
"Display it. Separately—don't let it show on my primary monitors."
"Clarification: display where?"
Yuna pulled out her personal tablet from her bag. "Here. Secure connection only."
A moment's pause. Then her tablet screen lit up with yesterday's data:
Subject: Z-0
Status: Stable
Heartbeat: 71 bpm
Triggers (past 24h): algae_smell, laughter, wave_sound
Recent Incidents:
14:23 - laughter -> tachycardia -> arrhythmia (resolved, 00:08)
Real. Still real. Not a hallucination brought on by too much coffee and too little sleep.
Yuna photographed the screen with her phone, then cleared the tablet. If they were watching her computer—and they clearly were—her personal devices might be safer. Might.
"Rose, new query. I need you to analyze patterns in the M-300 series data. Specifically, look for correlation between telomerase activity fluctuation and any external variables."
"Processing. Parameters?"
"Cast a wide net. Environmental factors, time of day, any concurrent experiments running in adjacent lab spaces. Anything that might affect cellular behavior."
"Estimated completion: eleven minutes."
Eleven minutes. Yuna used them to look normal. She opened her email, replied to a colleague about next week's department meeting, skimmed a journal article about CRISPR applications in age-related disease. The kinds of things a researcher would do on a normal morning.
At 7:04, the analysis completed.
"Results available," Rose said. "Primary correlation identified: telomerase activity fluctuation correlates with deletion of tumor monitoring data."
Yuna's coffee cup stopped halfway to her mouth. "Say that again."
"In all cases where telomerase activity showed anomalous patterns, corresponding tumor screening data is absent from the record. The correlation coefficient is 0.94."
Someone was deleting tumor data specifically when telomerase activity did something interesting.
"Rose, can you determine when the deletions occurred?"
"Accessing system logs... Deletion events cluster in three time periods: March 2021, August 2022, and January 2025."
January 2025. Five weeks ago.
"Who authorized the deletions?"
"Administrative credentials. User ID: T.Yoshida."
Her supervisor. The man who'd told her to drop it, to mark it classified, to stop asking questions.
The man who'd accessed her terminal last night to see what she'd found.
Yuna saved Rose's analysis to her phone, then deleted it from the lab system. If Yoshida was monitoring her queries, she didn't want him knowing she'd connected the dots.
She was going to need more than dots, though. She needed proof. She needed to understand what telomerase control did that made tumor data so dangerous to keep around.
And she needed to find out where Subject Z-0 actually was.
At 9:15, Yuna walked to the second-floor archive room. ReGeneLab kept physical backup records of all major experiments—a paranoid redundancy from the early days, before cloud storage was reliable. Most researchers never used them. The files were organized by year and project code, filling rows of gray metal filing cabinets that smelled like dust and old paper.
Yuna found the M-300 section and pulled the 2021 drawer.
Empty.
She checked 2022. Also empty.
2025's drawer was locked.
"Looking for something?"
Yuna spun. A man stood in the doorway—mid-forties, gray suit, ID badge clipped to his belt. She'd seen him around but never spoken to him.
"Just checking on some old files," she said, keeping her voice level. "For reference."
"Kenji Kiritani. Security and Compliance." He stepped into the room, and Yuna noticed he was positioning himself between her and the door. "Those files require authorization to access."
"I have research privileges."
"Not for archived materials, you don't." His tone wasn't hostile. Just... procedural. Like he was reading from a script. "Dr. Yoshida wanted me to have a word with you."
Of course he did.
"About what?"
"About staying within your assigned research scope." Kiritani pulled out a small tablet, tapped a few times. "You've been accessing deletion logs, running unauthorized queries on classified projects, and attempting to reconstruct data that was removed for corporate security reasons."
Yuna's pulse ticked up. "I'm investigating anomalies in my assigned data set. That's standard research practice."
"Not when the anomalies are classified." Kiritani looked up from his tablet. "Dr. Yoshida has asked me to monitor your system access. If you continue pursuing restricted information, I'll have to escalate this to upper management. That wouldn't be good for anyone."
The threat hung in the air, polite and absolute.
Yuna nodded. "Understood."
"Good." Kiritani smiled—professional, empty. "I'm glad we could have this conversation. Have a productive day, Dr. Shirasaki."
He left. Yuna waited thirty seconds, then followed. But instead of returning to her office, she took the stairs to the medical wing.
ReGeneLab's medical facility was small—just a clinic for employee health checks and minor injuries. But it had staff who talked. Medical people always talked.
Yuna found the break room empty except for one nurse, a woman in her fifties named Kimura who'd bandaged Yuna's hand last year after a broken beaker incident.
"Dr. Shirasaki," Kimura said, looking up from her coffee. "Everything okay?"
"Yes, just... needed a walk. Clear my head." Yuna poured herself water from the cooler. "Been busy down here?"
"Same as always. Couple of checkups this morning, nothing exciting." Kimura stirred her coffee. "You look tired. Working too hard?"
"Probably." Yuna leaned against the counter, trying for casual conversation. "I keep weird hours. Sometimes I wonder if anyone actually sleeps in this building."
Kimura laughed. "You should see the night shift reports. There's always someone here. Though I suppose that's true for any facility with ongoing monitoring."
"Monitoring?"
"Oh, you know. The long-term studies, the continuous data collection. We have equipment running 24/7." Kimura sipped her coffee. "Actually, speaking of which, I saw something strange the other day. A supply order came through for advanced cardiac monitoring gear. The expensive kind, with real-time arrhythmia detection."
If you spot this tale on Amazon, know that it has been stolen. Report the violation.
Yuna's hand tightened on her water cup. "For what study?"
"That's the thing—it wasn't for any official study I knew about. The order came from upper management, marked as confidential. But I saw the specifications. That equipment isn't for mice."
"What do you mean?"
Kimura lowered her voice. "The sensor configurations, the monitoring protocols—they're calibrated for human subjects. Adolescent, specifically."
The water cup felt very cold in Yuna's hand.
"Did you ask anyone about it?"
"I mentioned it to Dr. Yoshida." Kimura's expression darkened. "He told me it was for a consulting project with another facility. But the delivery address was here. Building C, basement level."
Building C. Yuna had never been to Building C. She'd assumed it was just storage.
"When was this?"
"Two weeks ago. Why?"
"Just curious." Yuna set down her cup. "Thanks for the coffee break."
"Anytime. And Dr. Shirasaki? Be careful. Whatever you're looking into... I don't think management wants it looked into."
Yuna managed a smile. "Noted."
Building C was across the courtyard from the main research complex. Yuna had walked past it hundreds of times without thinking about it. Just another gray building in a campus of gray buildings.
The entrance required keycard access. Yuna's card didn't work.
She stood there for a moment, considering her options. She could ask Naruse—he had higher clearance as the external liaison. But that would mean explaining why she needed access. And Naruse, for all his friendliness, reported to the same management Yuna was now actively investigating.
Her phone buzzed. A text from an unknown number:
You should stop.
Yuna stared at the message. No context. No signature. Just those three words.
She replied: Stop what?
Three dots appeared, indicating typing. Then stopped. No response came.
Yuna pocketed her phone and walked back to the main building. She needed a different approach. Something that didn't involve doors she couldn't open or questions she couldn't ask directly.
She needed to find someone who already had the answers.
At 3:00 PM, Yuna was back at her workstation when Naruse knocked on her doorframe.
"Hey. Got a minute?"
"Sure." Yuna gestured to the empty chair beside her desk.
Naruse sat, running a hand through his hair—a nervous tell she'd learned to recognize. "Listen, I heard Kiritani had a talk with you this morning."
Word traveled fast.
"He mentioned I should stay in my lane," Yuna said carefully.
"He's not wrong." Naruse leaned forward. "Yuna, I like you. You're a good researcher. But you're poking at something that has very large, very well-funded interests behind it."
"What interests?"
"HelixGen, for starters. They're one of our primary funding sources. If they decide ReGeneLab is a liability instead of an asset, this whole facility shuts down. Everyone here loses their job."
"Even if what we're researching is—"
"Especially then." Naruse's voice dropped. "Look, I don't know what you found. I don't want to know. But whatever it is, it's not worth your career. Trust me on this."
Yuna studied his face. Naruse wasn't a bad person. He had a mother in an expensive care facility. He had bills that required a steady job. He'd made the calculations that many people make: how much truth can I afford?
"What if it's not about my career?" Yuna asked quietly.
"Then you're already in trouble."
Naruse stood to leave, then paused at the door. "There's a name you should know. Dr. Takeshi Umino. He used to work here, back in 2019. Brilliant researcher. Family man. One day he just... stopped showing up. HR said he'd resigned for personal reasons, but his office looked like he'd left in the middle of a workday. Coffee still warm on his desk."
"What happened to him?"
"No one knows. But his last project before disappearing? It was the initial telomerase control trials." Naruse met her eyes. "Whatever happened to Umino, it happened after he asked too many of the same questions you're asking now."
He left.
Yuna sat very still.
Dr. Takeshi Umino. Personal reasons. Disappeared.
She opened a new search query, this time not through Rose. Just standard internet, public records, anything that wouldn't flag internal monitors.
Takeshi Umino. Molecular biologist. Published seven papers between 2015-2019, all on telomere dynamics. Then nothing.
But in his last paper, published March 2019, there was an acknowledgment section. Standard stuff—thanking colleagues, funding sources, family.
Special thanks to my son, whose courage inspires this work daily.
A son.
Yuna's hands started typing before she'd consciously decided to.
"Rose, access ReGeneLab's old HR records. I need family information for Dr. Takeshi Umino."
"Accessing... Record found. Dr. Umino listed one dependent: Shizuka Umino, son, date of birth April 2011."
April 2011. That would make him fourteen years old now.
Fourteen.
The exact age specified in the Z-0 biosignal data.
Yuna's screen blurred. She blinked, forced herself to focus.
A researcher who worked on telomerase trials. A son. A sudden disappearance. And a Subject Z-0 who was fourteen years old, monitored 24/7, whose body treated everyday sounds like threats.
Special thanks to my son, whose courage inspires this work daily.
Not gratitude. Not inspiration.
Consent.
Dr. Umino had enrolled his own son in the experiment.
And then he'd disappeared.
Yuna worked until 8 PM, when the building was mostly empty. Then she did something she'd never done before: she went to the basement.
The stairwell to the lower levels was at the far end of the main building. Yuna had seen it but never used it—most researchers had no reason to go below ground level. But if Building C's basement held Z-0, maybe the main building's basement held answers about why.
The lower level was older than the rest of the facility. The walls were concrete instead of drywall, the lighting more industrial. Storage rooms, mechanical spaces, archived equipment.
And at the end of a long corridor: a door marked RESTRICTED ACCESS.
Yuna's keycard definitely wouldn't work here.
But the door had a small window. Reinforced glass, but transparent.
She looked through it.
The room beyond was dark, but emergency lighting provided enough illumination to see: banks of servers, humming quietly. Data storage. The kind of system that would handle large amounts of continuous monitoring data.
And on one server rack, a small label: Z-SERIES BIOSIGNAL ARCHIVE.
Yuna took a photo through the window. The glass created some glare, but the label was readable.
"Can I help you?"
She jumped. Kiritani stood at the corridor entrance, the same professional expression on his face.
"I got turned around," Yuna said. "Looking for the bathroom."
"Bathrooms are upstairs. All of them." Kiritani walked closer. "It's interesting. You got turned around in a direction that required passing three clearly marked exits and descending two flights of stairs."
"I was distracted."
"I'm sure you were." Kiritani gestured toward the stairwell. "Let me escort you back to ground level. Make sure you don't get turned around again."
They walked in silence. At the top of the stairs, Kiritani stopped.
"Dr. Shirasaki, I'm going to give you some advice. Not as security, just as someone who's worked here longer than you. Sometimes people dig into things because they think they're helping. They think they're doing the right thing. But they don't see the whole picture. And when you don't see the whole picture, you can do a lot of damage."
"What's the whole picture?"
"That's above both our pay grades." He held the door open. "Go home. Rest. Tomorrow's a new day."
Yuna went home. But she didn't rest.
At midnight, lying in bed with her laptop balanced on her knees, Yuna compiled everything she had:
- Subject Z-0: fourteen-year-old male, human, continuous monitoring
- Triggers: laughter, algae smell, wave sound → cardiac events
- Deleted tumor data correlating with telomerase anomalies
- Dr. Takeshi Umino: disappeared 2019, had a son named Shizuka, born 2011
- Building C basement: advanced cardiac monitoring equipment
- Main building basement: Z-series biosignal archive
It added up to something horrifying.
ReGeneLab—or HelixGen, or whoever was really running this—had performed telomerase control experiments on a child. The researcher's own child. And whatever they'd done had left him in a state where ordinary sensory input could trigger life-threatening cardiac events.
But why continue monitoring him? Why keep the experiment running for six years?
Unless it was working.
Unless whatever they'd done to Shizuka Umino had actually extended his life in some way that made the terrible side effects acceptable.
Unless they considered him a success.
Yuna closed her laptop. Minami's photo was on her nightstand, backlit by the soft glow of her alarm clock.
If the technology had existed, Yuna thought, would I have said yes? If someone had offered to save Minami, but with side effects we didn't understand... would I have signed the consent form?
She knew the answer.
She would have signed anything.
Which meant she couldn't judge Dr. Umino for doing the same.
But she could try to understand what he'd done. And whether Shizuka Umino was still alive. Still suffering. Still isolated in some facility where laughter was a hazard.
Her phone buzzed. Another message from the unknown number:
Last warning.
Yuna didn't respond. Instead, she opened a new document and began typing. Everything she'd learned. Everything she suspected. All the evidence she'd gathered.
If something happened to her—if she ended up like Dr. Umino, disappeared and erased—someone would need to know the truth.
She finished typing at 2 AM. Then she encrypted the file, backed it up to three different cloud services under fake accounts, and finally allowed herself to sleep.
The next morning, Yuna arrived at the lab to find her keycard deactivated.
She tried the main entrance three times. Nothing. The light stayed red.
Through the glass doors, she could see the reception desk. The security guard there—not Kiritani, someone younger—noticed her and picked up a phone.
Five minutes later, Dr. Yoshida emerged.
He opened the door but didn't invite her in.
"Shirasaki-san. We need to talk."
"Is there a problem with my access?"
"Your access has been temporarily suspended pending a review." Yoshida's expression was tired. Sad, almost. "You've been accessing restricted data, attempting to enter secure areas, and ignoring direct instructions to cease investigation into classified materials."
"I was just—"
"I know what you were doing." Yoshida lowered his voice. "And I understand why. But you need to stop. For your own safety."
"My safety? Or the company's liability?"
"Both." He glanced back at the building, then at her. "Go home, Yuna. Take a few days. When you come back, we'll discuss your ongoing role here. But right now, you need to step away."
"And if I don't?"
"Then your employment will be terminated. And you'll be required to sign an NDA that will prevent you from ever discussing anything you learned here." Yoshida's voice was gentle but firm. "You're a talented researcher. You have a future in this field. Don't throw it away for something you don't fully understand."
Yuna looked at the building behind him. Somewhere in there, or in Building C, or in some facility she hadn't discovered yet, a fourteen-year-old boy was being monitored. Living with a body that treated the world as an enemy.
And everyone here knew.
They all knew, and they'd decided it was acceptable.
"Rose," Yuna said quietly, knowing the AI could hear her through her phone. "Document this conversation."
"Recording," Rose confirmed through her earbud.
Yoshida heard. His expression shifted—disappointment, maybe. Or resignation.
"I'm sorry it came to this," he said. Then he went back inside.
The door locked behind him.
Yuna stood in the parking lot, the ocean wind cold against her face.
She'd been fired. Or suspended, which was really the same thing.
But she still had all her research. All her evidence. All the pieces she'd gathered.
And she had Rose, who remembered everything.
Yuna walked to her car. Started the engine. Sat there for a moment, hands on the wheel.
Then she pulled out her phone and sent an email to the one person she thought might still help her.
Dr. Naruse,
I know you told me to stop. But I can't. Subject Z-0 is real. He's fourteen years old. His name might be Shizuka Umino. And I think he's still alive.
If something happens to me, please make sure someone knows.
She sent it. Started driving.
She didn't know where she was going yet.
But she knew she wasn't stopping.