Time didn't flow on Highway 81. It pooled. It stagnated.
Mac stared at the digital clock on the dash. 12:42 AM. He swore the last time he checked it, it had been 12:41, and that felt like half an hour ago.
Outside the windshield, there was nothing but the thick, swirling fog. The headlights cut through the grey soup but revealed absolutely nothing—no guardrails, no road signs, no reflective markers. Even the asphalt beneath the tires was featureless, devoid of painted lines or the subtle bumps of a real highway. It felt less like driving and more like floating in a void.
The only thing anchoring Mac to reality was the GPS screen, a stark black void with a single, unyielding red line, and the rhythmic, guttural breathing coming from the trailer behind him.
In... out. In... out.
At first, the sound had paralyzed him. It was too heavy, too wet. It sounded like a pair of massive, fluid-filled lungs expanding against the corrugated steel. But as the miles dragged on in the sensory deprivation chamber of the fog, Mac found a twisted, desperate comfort in it. The manifest had been clear: This means the cargo is stable. As long as whatever was in the box kept breathing, Mac kept driving. Fifteen thousand dollars. He just had to keep the truck on the red line.
He uncurled his stiff fingers from the steering wheel one at a time, wiping his sweaty palm on the denim of his jeans. The cab was freezing, yet the collar of his canvas jacket was soaked with cold sweat.
He risked a glance at the fuel gauge. Full. It hadn't moved a millimeter since he turned the key. Neither had the engine temperature.
"Just a long haul," Mac muttered to himself, the sound of his own voice startling him in the quiet cab. "Just a drive through the middle of nowhere. Keep it between the ditches."
He reached out to turn on the radio, desperate for the sound of a late-night DJ or even a terrible pop song to break the tension. His fingers brushed the plastic dial.
He froze.
Rule 5: The radio will turn itself on at 2:14 AM.
He snatched his hand back as if the plastic dial were glowing red-hot. He couldn't touch it. He couldn't touch anything that wasn't the steering wheel, the gas pedal, or the brakes. He was a prisoner in the driver's seat.
Mac swallowed hard, returning both hands to the ten-and-two position.
Then, the breathing stopped.
It wasn't a gradual fade. It was an abrupt, choking halt, like a massive hand had suddenly clamped over a windpipe.
The immediate silence was deafening. It rushed into the cab, pressing against Mac's eardrums with physical weight. The heavy vibration that had been thrumming through his seat ceased completely.
If the shifting stops, tap your brakes twice.
Mac's eyes darted to the manifest taped to the wheel.
If it does not resume, pull over, lock your doors, and close your eyes. We will send a clean-up crew. Do not look in the side mirrors.
"No, no, no," Mac hissed, panic surging up his throat. The truck was coasting through the endless fog at sixty miles an hour. He didn't want to tap the brakes. Tapping the brakes meant acknowledging the thing in the back. Pulling over in this void meant waiting in the dark for a "clean-up crew."
Seconds ticked by. The silence stretched. The hairs on Mac's arms stood straight up. He could feel an unnatural cold seeping through the steel firewall behind his seat, a creeping frost that chilled the air in the cab.
He had to do it.
Mac lifted his right foot from the accelerator. He hovered it over the wide, heavy brake pedal.
Tap. Tap.
The air brakes hissed sharply. The massive truck lurched slightly, dropping a few miles per hour, then coasted.
Mac held his breath. He stared straight ahead at the hypnotic red line on the GPS. He waited. Five seconds. Ten seconds.
Nothing. Just the hum of the tires on the impossible asphalt.
"Come on," he begged in a ragged whisper. "Breathe. Just breathe."
His gaze instinctively drifted toward the driver's side mirror. It was human nature to look for the source of danger. Out of the corner of his eye, the mirror reflected the long, matte-black side of the trailer and the swirling grey fog.
Do not look in the side mirrors during this time.
Mac squeezed his eyes shut and violently snapped his head forward, locking his gaze on the speedometer. He dug his nails into the steering wheel until his fingertips ached. If he pulled over, the shift was a failure. The contract didn't say what happened if the clean-up crew came, but in a "dimensional sector" where termination was literal, he didn't want to find out.
Fifteen seconds.
The cold radiating from the sleeper cabin behind him intensified. It felt like standing in front of an open industrial freezer.
He was going to have to pull over. He began to ease his foot down on the brake pedal to bring the massive rig to a halt in the fog.
THUD.
A concussive impact hit the inside of the trailer walls, so violent that the entire eighteen-wheeler swerved a foot to the left. Mac wrestled the wheel, overcorrecting, his heart hammering against his ribs as the tires whined against the smooth road.
Then, an explosive, ragged gasp tore through the metal.
It was a wet, horrific sound, like a drowning man breaking the surface of the water and dragging oxygen into desperate lungs. The deep, rhythmic thrumming returned, faster now, vibrating violently through Mac's seat.
In-out. In-out. In-out.
Mac let out a choked sob of relief, pressing his foot back down on the accelerator, steadying the truck. "Okay. Good. We're good."
He dragged a shaking forearm across his sweaty forehead. The paralyzing cold retreating from the sleeper cabin, replaced once again by the faint smell of ozone and old leather. He had survived his first mechanical error. He had followed the rule.
He glanced back down at the GPS.
The red line was no longer the only thing on the screen.
In the top right corner, a small, pixelated digital counter had appeared. It read: Mile 42.
As Mac watched, it flickered to Mile 43.
Outside the windshield, the grey, swirling fog began to thin. The pitch-black night above it was slowly peeling away, bleeding into an ugly, bruised purple.
Mac's eyes snapped to the manifest.
Rule 4: Mile Marker 45. The sky will turn a bruised purple, and the road lines will disappear. Maintain a speed of exactly 45 MPH.
He looked at the digital speedometer glowing green on the dash. He was currently going sixty-two.
The GPS flickered.
Mile 44.