The Erasure Department
The first thing they teach you at the Academy is that time travel must be impossible.
The second thing they teach you is how to shoot someone in 1847. The contradiction is intentional.
Agent Elias Mercer had personally prevented the invention of time travel 3,281 times.
It always started differently.
A physicist in Geneva.
A monk in 1273 whose mathematics somehow ran centuries ahead of humanity.
A bored AI running on a lunar server in 2094.
A teenage girl who accidentally proved temporal topology while trying to optimize Minecraft redstone.
The universe seemed obsessed with discovering the same forbidden equation, Like gravity. Like prime numbers.
Like death.
Some ideas were inevitable. Time travel was one of them. That was why the Erasure Department existed.
Mercer stepped out of the doorway into Boston, 2038. The doorway looked like an ordinary maintenance closet. It always did. Temporal mechanics hated drama.
A young researcher sat alone inside MIT’s Quantum Dynamics Building. Dr. Maya Chen. Age twenty-nine. Brilliant. Harmless. Currently eating cold Chinese food while writing what appeared to be a paper on quantum decoherence.
Mercer sighed. He’d seen this one before.
Not Maya. Someone like her. Always someone like her. The report floated before his eyes.
SUBJECT HAS ACHIEVED 97.3% OF THE NECESSARY DERIVATION.
Estimated completion:
2 hours.
Risk Assessment:
Universal Collapse.
Recommended Action:
Immediate Termination.
Mercer closed the report.
He hated the word “termination.” They were people. Especially this one.
The Department had once tried simply hiding the knowledge.
Destroy the notebook.
Erase the hard drive.
Burn the lab.
It never worked. Someone else would rediscover it, sometimes within days. Sometimes centuries earlier. Knowledge wanted to exist.
Eventually they tried recruiting inventors. That was worse. Nobody could resist. Imagine possessing a machine capable of undoing every mistake.
Saving every loved one.
Preventing every war.
Nobody ever kept the promise.
Nobody.
So now? They killed them.
Quickly. Quietly. Mercifully. One death instead of all of reality.
Mercer entered the building wearing the face of a janitor. People rarely noticed janitors. (Or temporal agents.)
The hallway was empty. Room 417.
Maya looked up.
“You don’t work here.”
“No.”
“You’ve got the wrong office.”
“No.”
She frowned. There was something unsettling about him, like a photograph that moved slightly when you weren’t looking. Mercer pulled the small pistol from inside his jacket. It didn’t fire bullets. Bullets made evidence. This simply removed electrical activity from the brain. Death in less than two nanoseconds. Painless.
She stared at it.
“...What is that?”
He answered honestly.
“A mercy.”
“A what?”
“I’ve had this conversation thousands of times.”
“What conversation?” Maya asked.
“The one before I kill someone.”
She laughed nervously.
“Okay... this is some kind of joke.”
“No.”
“What do you want?” Maya asked, fear creeping into her voice.
“You discovered something.”
“I publish papers.” Maya said, lying.
“Not this one.”
Her expression changed again. She hadn’t told anyone. Not even her advisor. Mercer saw it. The moment she realized he knew.
“...Who are you?”
He hesitated. Protocol required silence. Instead he said, “I work in history.”
“I don’t understand.”
“You will.”
He glanced at the clock.
1 hour, 53 minutes.
Closer.
He continued.
“You think you’ve solved quantum causality.”
Her eyes widened.
“You’ve read my notes?”
“I’ve read them 641 times.”
“That’s impossible.”
“Yes.”
Silence.
“...You built it.”
“What?”
“The equations. Then the device. You build a temporal displacement engine.”
She stared, Then laughed.
“No.”
“You do.”
“No.” she said, trying not to cry.
“You already have.”
“That doesn’t even make—”
“It does from my reference frame.”
He should have shot her then.
Instead? He was tired. Three thousand assignments. Three thousand conversations. Three thousand brilliant people who all believed they were about to change the world.
They always were, Just not the way they imagined. He sat down.
“I’ll tell you something nobody else will ever remember.”
She said nothing.
“The universe has ended.”
“What?”
“Sixteen times.”
She blinked.
“...Excuse me?”
“You think history is one line. It isn’t. It’s a rope. Thousands of strands. Most disappear. Some knot together. Occasionally? They snap.”
He looked toward the window.
“I’ve watched the stars go out. I’ve watched Earth vanish because someone prevented the invention of steel. I’ve watched humanity evolve into silicon. I’ve watched dinosaurs invent radio.”
She laughed.
“You expect me to believe that?”
“No. I expect you to understand why you’re about to die.”
She stood.
“No.”
“No?”
“I’m not accepting that.” She said, wiping a tear from her eyes.
“You don’t have to.”
She grabbed a notebook.
“If time travel exists then prove it.”
Mercer smiled sadly. “Everyone asks.”
He reached into his pocket, and produced a photograph. It showed Maya. Older. Gray hair, holding hands with a little girl.
Behind them stood Mercer. He was older, too.
She frowned.
“...Photoshop.”
“No.”
“Generative AI.”
“No.”
Mercer watched her face. She understood. “The child? Is that my daughter?”
Mercer nodded sadly.
She stared.
“...Who’s the father?”
Mercer looked away, and lied.
“I never learned.”
Her face slowly lost color.
“You knew me.”
“I will.”
“...Will?”
“From my perspective...” He smiled, sadly. “We’ve been friends for forty years.”
The room became very quiet. She whispered, “...Then why?”
He answered immediately. “Because in thirty-eight years you beg me to.”
She stopped breathing.
“What?”
“You tell me...”
He remembered her voice perfectly.
“‘If I ever get close... promise you’ll stop me.’” You cry. You already know what happens. I ask if you’re sure. You tell me yes. You say...”
He closed his eyes.
“‘The universe isn’t worth my curiosity.’”
She slowly sat back down.
“...You’re lying.”
“I wish.”
She looked at the gun, then at him.
“If I don’t discover it...” she said, voice trailing off.
“Someone else will.” Mercer finished.
“If you kill me...”
“Someone else eventually will figure it out..”
“Then what’s the point?”
He smiled. “The delay.”
“The delay?”
“Every year matters. Every decade. The universe is fragile. We buy it time.”
“For what?”
Mercer looked strangely hopeful. “We don’t know.”
She frowned.
“You’re buying time for something you don’t understand?”
“Yes.”
“That’s insane.”
“It probably is.”
“So why keep doing it?”
He looked directly into her eyes.
“Because one timeline survived.”
She leaned forward.
“What?”
“One.”
“Out of...”
He shrugged.
“We stopped counting after the first million. We estimate hundreds of trillions.”
Mercer felt something. AFter thousands of trips, something, an instinct, suddenly scared him. He looked at Maya. Really looked. Something was different.
Her notebook. One equation. One symbol. One tiny correction. He’d never seen it before.
His blood froze. No.
No no no.
That wasn’t right. She noticed. “What?”
Mercer whispered, panic in his voice. “...You’ve changed.”
His communicator exploded with alarms.
TIMELINE DIVERGENCE DETECTED.
UNAUTHORIZED CAUSAL EVOLUTION.
SOURCE: AGENT MERCER.
Impossible.
He hadn’t done anything. Then he realized he had. He’d talked too long. Every previous version of this meeting had ended within thirty seconds. Today? He’d spent nearly fifteen minutes.
The walls flickered. Reality bent. The office existed in six different decades simultaneously. Paint peeled backward. Coffee became beans. Concrete became wet. Mercer heard voices, Millions of them.
All versions of himself, screaming.
His communicator spoke with the calm voice of Administration.
“ Agent Mercer. You have contaminated causality. Correction team dispatched. Estimated arrival, Thirty seconds.”
He looked at Maya, Then laughed. He actually laughed, for the first time in centuries.
“So that’s what happened.”
“What?”
“I always wondered who almost broke reality.”
She looked confused.
“It was me.”
She whispered,
“What do we do?”
Mercer looked toward the place where several seconds from now, reality itself would arrive to erase them both.
He holstered the gun.
“I have absolutely no idea.”
She blinked.
“I thought you knew everything.”
“I know history.”
He smiled.
“This...”
He opened the notebook.
“...has never happened before. And it never will again.”
This one took me a while to work up to reading. The grimdark kind of opening tried very hard to push me out.
That said, it’s a solid story. Well done.
Oh, very well done!