SPLIT

Elias Venn stepped into the ring before he could talk himself out of it.

Cold surged through his right arm. He glanced down and watched in disbelief as his hand disappeared, followed by his wrist, elbow, and shoulder. For one weightless instant, he felt nothing beneath his feet.

Then he stumbled forward, barely catching his balance as his boots struck the laboratory floor.

Behind him, the machine hummed steadily. A screwdriver vibrated off the workbench and clattered onto the concrete.

Elias hardly noticed.

Something was different.

He stood perfectly still, trying to understand what had changed. For months, a deep, relentless pain beneath his ribs had made every breath an ordeal. He'd learned to take shallow breaths, climb stairs slowly, and hide his trembling hands whenever customers brought broken equipment into his shop. Even simple tasks had become exhausting.

But now...

He drew a deep breath and held it, waiting for the familiar stabbing pain.

Nothing.

He exhaled slowly and tried again, filling his lungs until he could breathe in no more.

Still nothing.

He pressed his hand against his side.

"No way."

His voice sounded normal. No coughing, no strain. He turned toward the computer, where a single message glowed on the screen.

RETURN COMPLETE.

One minute backward. One minute forward.

The entire journey had taken less than a second in the laboratory.

Eleven years of work. Eleven years of calculations, failed experiments, burned-out components, and nights spent sleeping on a cot beside the workbench. Eleven years of people telling him that what he was attempting was impossible.

And now he'd done it.

But the machine had accomplished something far more extraordinary than he'd imagined.

Elias bent down to retrieve the screwdriver.

His knees didn't protest. His balance was steady, and for the first time in months, his fingers weren't trembling.

He turned the tool over in his hand, almost laughing at the simplicity of the movement.

Then he hurried to the medical monitor beside the bench and clipped the sensor onto his finger.

The numbers appeared.

He frowned and leaned closer.

"That can't be right."

He removed the sensor, rubbed his finger against his shirt, and tried again.

The readings settled almost exactly where they'd been before. His pulse was steady, his blood oxygen level normal.

He hadn't seen numbers like those since before his diagnosis.

His physician had given him three months to live. Four, if he was fortunate.

That prognosis had driven him to finish the machine. He couldn't bear the thought of dying with eleven years of work sitting unfinished in his laboratory.

He'd built it to travel through time, not to save his life.

Yet here he was, breathing without pain.

He couldn't claim to be cured. Not without tests. But whatever was happening inside his body, he hadn't felt this good in years.

Elias leaned against the workbench and laughed. He couldn't help it. For the first time in months, the possibility of a future had become something more than wishful thinking.

Then something caught his eye.

He turned toward the portal.

The opening should have been empty. Instead, a black mass hung near its center, roughly the size of his fist.

At first, he thought it might be smoke or residue from the energy field. But smoke didn't behave like that.

The substance seemed to fold in on itself, its surface constantly shifting. A thin strand extended from one side, withdrew, then reached outward again.

Elias stopped smiling.

"What in the world is that?"

He moved closer.

The mass shifted toward him.

He stopped, and it stopped.

Curious now, he stepped to his left. The substance followed. When he moved right, it changed direction again.

A narrow black thread stretched from the center of the ring, pointing directly toward his chest.

Elias backed away.

"Okay. I don't like that."

The thread continued extending toward him.

He glanced at the controls, wondering if shutting down the portal would stop it.

He never got the chance.

The mass suddenly tore free.

Elias threw up his arm, but the substance passed straight through his sleeve. He felt a brief, penetrating cold against his chest before it disappeared into him.

There was no impact, no resistance.

It simply entered his body.

The pain returned so violently that his knees buckled.

He collapsed beside the stool, striking the concrete hard enough to knock the breath from his lungs. Instinctively, he curled onto his side and wrapped an arm around his ribs.

Every attempt to breathe sent another wave of pain through his chest.

The medical monitor began sounding an alarm.

Elias reached for the workbench but couldn't pull himself up. His hands were shaking again, worse than before.

He turned his head toward the portal.

It was empty.

Through the opening, he could see his coat hanging on the opposite wall.

The black substance was gone.

And he knew where it had gone.

Inside him.

"No," he whispered.

He tried to stand, but his legs wouldn't support him. Instead, he dragged himself toward the bench, caught the charging cord hanging over its edge, and pulled until his phone slid within reach.

He found Nadi's number.

The phone rang four times before she answered.

"Elias?"

"I need you at the lab."

"What's happened?"

He struggled to draw a breath.

"I can't breathe."

"Call emergency services. Right now."

"Just come. Please."

"Elias, listen to me. Are you having chest pain?"

"Nadi..."

He heard movement on her end of the call.

"All right, I'm coming. But you need an ambulance."

"The shop door's unlocked."

"Elias, don't hang up."

He lowered the phone to the floor beside him.

He knew she was right about calling for help. But he'd spent months hearing doctors explain what they couldn't do for him, and for a few extraordinary moments, he'd been completely free of pain.

Something inside that machine had changed him.

He needed to understand what.

The computer screen glowed above him. Beneath the return message was a recording of his journey through the ring.

Elias caught the edge of the stool and pulled himself high enough to reach the keyboard.

He started the playback.

There he was, stepping out of the machine, standing straight, breathing normally. He watched himself laugh, remembering the overwhelming relief of those first few seconds.

Then the black substance appeared.

He watched it gather inside the portal and move toward him. The instant it entered his chest, the recorded Elias collapsed.

He played it again, leaning closer despite the pain.

There was no mistaking what had happened.

The machine had taken something out of him.

And then it had put it back.

He opened the return log and began scanning the entries. Most contained routine system data: timing, energy consumption, reconstruction sequences.

Near the bottom, one line caught his attention.

UNASSIGNED MATERIAL: RETURNED TO SOURCE.

He stared at the message.

"Oh, you've got to be kidding me."

The collection system.

Of course.

He'd designed the machine to account for every particle belonging to the traveler. Anything separated during transit was automatically returned during reconstruction.

It was a safeguard intended to prevent the traveler from losing matter during the process.

He'd never considered that some of that matter might be better left behind.

There had been nowhere else for the black substance to go.

So the machine had sent it home.

Elias leaned back, trying to ease the pressure in his chest.

For a few seconds, the pain had disappeared. Whatever the machine had removed, he needed to keep it out.

And if it could separate the material once, perhaps it could do it again.

He just needed somewhere to put it.

He pulled a sheet of paper from the bench and searched for a pencil. His hand shook so badly that the first few marks were nearly illegible.

At the top of the page, he wrote:

SEPARATE COLLECTION CHAMBER.

He began sketching a cylinder connected to the lower portion of the ring, with a pair of valves to isolate whatever entered it.

He was still drawing when the shop door opened.

"Elias?"

Nadi's voice echoed through the laboratory.

"Back here," he managed.

She appeared around the corner carrying her medical bag. The moment she saw him on the floor, she hurried over and knelt beside him.

"Oh, Elias. What have you done?"

She set the bag down and took his wrist.

"Look at me. Tell me what happened."

He tried to hand her the paper.

"Not yet." She moved it aside. "I need to examine you first."

She checked his pulse, listened to his breathing, and pulled an oxygen mask from her bag.

"When did this start?"

"After the return."

"The return?"

He nodded toward the ring.

Nadi followed his gaze.

"You went through it?"

He nodded again.

"Elias, you promised me you wouldn't test it alone."

"I know."

"You promised."

He didn't have the breath to defend himself, and frankly, he knew she was right.

She fitted the oxygen mask over his face and adjusted the flow.

"Did you lose consciousness?"

He shook his head.

"Did you take anything before the test? Medication? Anything at all?"

"No."

She studied his face.

"You're in worse condition than when I saw you yesterday."

He pointed toward the computer.

"Watch the recording."

"We'll get to that."

"Please, Nadi. You need to see it."

Something in his voice convinced her.

She stood beside him while he reached up and started the playback.

Nadi watched him emerge from the ring, straighten, and laugh. Then she leaned closer as the black substance formed in the opening.

"What is that?"

"I don't know."

She watched it enter his chest. On the screen, Elias collapsed.

For a moment, she said nothing.

"Play it again."

He did.

When the recording ended, she turned toward him.

"You're telling me you felt better before that thing touched you?"

"Completely. No pain, no weakness. I could breathe normally."

"And then it came back?"

"All of it. Worse than before."

Nadi glanced at the monitor.

"Whatever happened, those readings don't tell us what's going on inside your body. You need a hospital."

"They couldn't stop what was killing me yesterday."

"This isn't yesterday, Elias. You're having trouble breathing, and your condition is deteriorating. We need to get you medical attention."

"I think I know what happened."

"You have a theory. That's different."

He raised the drawing.

"And I think I know how to fix it."

Nadi studied the paper, then looked at him in disbelief.

"You're not seriously thinking of going through that thing again?"

"I need Tomas."

She closed her eyes for a moment.

"Elias..."

"Please. Call him."

Tomas arrived carrying a toolbox in one hand and his phone in the other. His shirt was buttoned unevenly, and judging by his expression, he'd gotten very little explanation of what was happening.

He stopped when he saw Elias.

"Good grief. What happened to you?"

Nadi stood beside the workbench.

"He went through the machine."

Tomas stared at her.

"He did what?"

"That's not the problem," Elias said.

Tomas looked back at him.

"You went through a machine that wasn't supposed to be tested on humans, and that's not the problem?"

"Just watch the recording."

Tomas set his toolbox down and approached the computer.

He watched the entire sequence without speaking. When it ended, he replayed it, studying the black substance as it separated from the portal and entered Elias's chest.

Finally, he pulled up a stool.

"All right. Tell me what you think happened."

"I think the machine separated diseased material from my body."

Tomas glanced toward Nadi.

"We haven't established that," she said.

"No," Elias admitted. "But whatever it removed, I felt better without it."

"And then the machine returned it," Tomas said.

"Exactly."

Tomas leaned back and studied the screen.

"Because the system thinks that stuff belongs to you."

"It does. At least that's how the program sees it."

"Then you need to give it somewhere else to go."

Elias pushed the drawing toward him.

"That's what I came up with."

Tomas studied the sketch.

"A separate chamber, two valves, independent collection."

"With its own return address."

Tomas nodded slowly.

"It might work."

"Can you build it?"

"Let me look at it first."

He tapped the paper.

"This valve won't close fast enough. Not if that stuff moves like it did in the recording."

Elias reached for the pencil, but his shaking hand left a crooked line across the page.

He steadied his wrist against the bench and tried again.

"Then we close it before the return sequence finishes."

Tomas examined the revised drawing.

"That would isolate it from the main portal."

"Right."

"But you're going through again, aren't you?"

Elias opened his mouth to answer and immediately broke into a violent coughing fit.

Nadi caught him as he folded forward.

"Easy. Don't try to talk."

The coughing continued until he could barely draw breath. When it finally stopped, he tasted blood.

Nadi wiped his mouth and looked at Tomas.

"We don't have much time."

Tomas studied the drawing again.

"Even if I can build this, there's no guarantee it'll work."

Elias pulled the oxygen mask aside.

"There's no guarantee I'll survive if we don't try."

For a moment, nobody said anything.

Then Tomas set the drawing on the bench and opened his toolbox.

"All right. Let's see what we've got."

They found a heavy steel cylinder among the parts of an unfinished cooling system.

It wasn't what Elias would have chosen under normal circumstances, but it had thick walls, an inspection window, and fittings that could be modified without waiting for replacement parts.

Under the circumstances, it would have to do.

Tomas carried it to the workbench and began removing the existing connections.

"Get me those fittings from the blue cabinet," he told Nadi.

She found them while Elias worked at the computer.

The collection software was still open, but making the necessary changes was becoming difficult. His vision blurred whenever he concentrated too long, and his fingers barely cooperated.

The machine had already demonstrated that it could separate the unwanted material. Now he needed to change what happened to that material afterward.

Instead of returning to his body, it would be diverted into the cylinder.

Tomas connected a short transfer tube between the ring and the chamber. Two valves would close once the material entered, isolating it from the portal.

He tightened the first fitting and checked the alignment.

"Hand me the smaller wrench."

Nadi passed it to him.

"How much longer?"

"Working on it."

"That's not what I asked."

Tomas glanced at her.

"I know. It's the best answer I've got."

Nadi returned to Elias.

His skin was clammy, and his breathing had grown shallower despite the oxygen.

She checked his pulse again.

"I really don't like this."

"Neither do I."

"Elias, I'm serious."

He looked up at her.

"So am I."

For a moment, the stubborn determination she'd come to expect from him gave way to something else.

"I'm scared too, Nadi."

She hadn't expected him to admit it.

He looked back at the screen.

"But I know what I felt when I came out of that machine. Something changed. I wasn't imagining it."

"I believe you felt better. But that doesn't mean we understand why."

"I know. That's what makes this so important."

She wanted to argue, but his condition was deteriorating, and they were rapidly running out of options he would accept.

Across the bench, Tomas hauled the laboratory vacuum pump into place and secured the intake hose to the cylinder.

He switched it on.

The pump rattled loudly as the pressure inside the chamber began to fall.

Tomas watched the gauge.

"Pressure's dropping. That's good."

Elias glanced toward the cylinder.

He didn't know how the strange substance would react under negative pressure, but isolating it in a low-pressure chamber seemed a reasonable starting point. At the very least, he hoped it would limit its movement long enough for them to study it.

The pump continued running while Tomas checked the fittings.

Elias returned to the computer and entered the final instruction.

He reached for the save key.

His finger missed.

He tried again, but this time his hand slipped off the keyboard.

Nadi moved beside him.

"Which one?"

He pointed.

She pressed it.

The screen flickered before displaying the new message.

COLLECTION CHAMBER READY.

Elias exhaled.

"Good."

Tomas finished checking the seals, disconnected the pump, and closed the outer valve. He watched the pressure gauge for several seconds.

The needle held steady.

"Negative pressure's holding."

"You're sure?" Nadi asked.

"As sure as I can be without spending the next three hours testing it."

Elias tried to stand.

His legs gave out before he cleared the stool.

Tomas caught him under one arm while Nadi took the other.

Together, they lifted him and helped him toward the ring.

It was only a few feet away, but Elias could barely move his legs. By the time they reached the threshold, his breathing had become ragged.

Nadi looked into the empty opening.

"Are you sure you want to do this?"

Elias shook his head.

"No."

She studied his face.

"Then why are we doing it?"

"Because I know what's going to happen if we don't."

Tomas shifted his grip.

"One more thing. If that chamber doesn't catch the material, the return program will still try to send it back into you."

Elias looked toward the cylinder.

"Then we'd better hope it catches it."

Nadi wasn't satisfied.

"And if it comes back into you again?"

Elias met her eyes.

"Then we didn't solve the problem."

Neither of them liked that answer.

Tomas reached for the controls.

The ring came alive, its familiar low hum growing deeper as the center of the opening began to shimmer.

Elias watched the distortion spread across the empty space.

He'd spent eleven years trying to make that happen. Now, standing before his own invention, he was terrified of stepping inside.

Tomas moved closer.

"Ready?"

Elias gave a small nod.

Together, they helped him lift one foot across the threshold.

For a fraction of a second, his weight vanished from their hands.

Then he was gone.

And just as suddenly, he was back.

Elias stumbled out of the ring, but this time he caught himself.

Tomas reached to steady him.

"Easy."

"Wait."

Elias stood still and took a breath.

A full, deep breath.

The pain was gone.

He tried another.

His lungs expanded without resistance. His legs held, and he could feel strength returning to his arms.

Nadi stood beside him, ready to catch him if he collapsed.

"Elias?"

He raised a hand, his attention fixed on the ring.

Behind him, the black substance was gathering again.

The same dense, shifting mass formed near the center of the opening. A thin strand reached outward, moving toward him.

Tomas gripped the valve handle.

"Come on," he muttered.

The strand extended farther.

Elias felt his stomach tighten.

For several agonizing seconds, nothing changed.

Then the strand stopped.

It bent downward.

The mass began stretching into a narrow ribbon, slowly drawing itself toward the transfer tube.

"That's it," Tomas whispered.

The substance slipped into the tube and disappeared inside the steel cylinder.

Something struck the chamber wall with a sharp metallic knock.

The first valve snapped shut.

Then the second.

The transfer system powered down.

For a moment, the only sound in the laboratory was the faint hum of the computer.

Elias stood beside the workbench, waiting for the pain to return.

He took another breath.

Then another.

Nothing happened.

Nadi approached him with the medical monitor.

"Let me check you."

She clipped the sensor onto his finger and watched the numbers settle.

His pulse was steady. His oxygen level had returned to normal.

She checked the sensor again before looking at him.

"How do you feel?"

Elias considered the question.

For months, he'd become so accustomed to pain and weakness that he'd almost forgotten what normal felt like.

He flexed his hands.

No shaking.

He pressed his fingers against his ribs, then took another deep breath.

"I feel..." He stopped, searching for the right words.

He looked at Nadi and smiled.

"I feel like myself again."

She glanced at the monitor.

"These readings are encouraging, but we still need proper tests."

"I know."

"And I mean real medical tests, Elias. Not just that machine."

"I heard you."

She studied him for another moment before shaking her head.

"Sit down."

He laughed softly.

"You're not going to let me enjoy this for even a minute?"

"You can enjoy it sitting down."

He smiled and took the stool.

For once, he didn't need it.

Tomas was still standing beside the cylinder, one hand resting on the outer valve.

"Would somebody mind explaining what just happened?"

Elias looked toward the ring, then back at the chamber.

"I think we figured out how to leave something behind."

Nadi folded her arms.

"Something that was inside your body."

"Yes."

"And we still have no idea what it actually is."

"Not yet."

She looked toward the cylinder.

"Then finding out needs to be our next priority."

Tomas finally released the valve.

"Before anybody gets too excited, I'd like to know whether that thing is going to stay where we put it."

Elias rose from the stool and approached the chamber.

Under the laboratory light, the inspection window reflected the workbench and the glow of the computer screen.

He leaned closer.

At the bottom of the cylinder rested a small accumulation of black material.

It wasn't moving.

The shifting surface and reaching strands were gone. Whatever strange activity had animated the substance inside the portal had stopped.

Elias checked the pressure gauge.

Still holding.

Interesting.

He couldn't yet explain why the material had stopped moving, but the negative pressure appeared to be suppressing its activity.

That didn't mean it was harmless. The substance had nearly killed him, and there was no reason to believe its dangerous properties had disappeared. The pressure was keeping it inactive, nothing more.

If the chamber lost containment, they had no way of knowing how quickly it might become active again.

Tomas stepped beside him and peered through the glass.

"I don't like the look of that stuff."

"Neither do I," Elias admitted.

"Is it safe in there?"

Elias glanced at the gauge.

"It's contained. That's all I can tell you."

Tomas nodded slowly.

"Well, I suppose that's something."

Elias continued studying the dark material.

Only minutes earlier, that same substance had nearly killed him. Now it sat behind steel and glass while he stood beside it breathing freely for the first time in months.

He thought about his diagnosis, the doctors, and all the months he'd spent preparing himself for the inevitable.

Then he looked toward the ring.

There were questions he couldn't begin to answer.

What exactly had been removed from his body?

Why had traveling through time separated it?

And if the process worked for him, what might it do for someone else?

He felt a surge of excitement at the possibilities, but forced himself to focus.

One question at a time.

Tomas broke the silence.

"So what do we do with it?"

Elias looked back at the cylinder.

For now, the negative pressure was holding and the substance remained motionless. Until they understood what they were dealing with, disturbing it would be foolish.

"Keep it sealed."

Tomas nodded.

Nobody reached for the valve.