Set the seen: MARK (40s), a truck driver.

A dark, isolated stretch of interstate highway at night.
The Killer in the Backseat” from the perspective of the other driver
It’s a long haul, those late-night runs. Just me, the rumble of the engine, and the endless ribbon of asphalt. You see a lot out here, things most folks wouldn’t believe. Tonight, it was a little sedan, a small car, moving a bit erratically. I noticed it a ways back, headlights swaying slightly, like the driver was fighting to keep it straight.
Then, I saw it. A flicker of movement in the backseat. Just a shadow, barely there, but enough to make my gut clench. I’ve seen enough weird stuff on these roads to know that wasn’t right. It wasn’t luggage shifting, or a coat falling. It was… deliberate.

My heart started pounding. I knew I had to do something. I couldn’t just keep driving. I sped up, trying to get closer. I flashed my high beams, trying to get the driver’s attention. Nothing. They seemed oblivious, or maybe they were too scared to react.
I pulled alongside, my big rig towering over their little car. I rolled down my window, the wind whipping past my face. ‘Pull over!’ I yelled, ‘Pull over now! You’re in danger!’

I saw the driver, a young woman, her face pale, her eyes wide with fear. She looked at me, confused, terrified. I knew I had to make her understand. ‘Someone’s in your backseat!’ I shouted. ‘They’re moving!’

She finally pulled over, shaking, her hands trembling. I stopped in front of her, blocking her path. I jumped out, running toward her car. ‘Get out!’ I yelled. ‘Get out of the car!’
She scrambled out, her eyes darting around. I pointed at her backseat. ‘Look!’ I said, my voice rough with urgency.

…I pointed at her backseat. ‘Look!’ I said, my voice rough with urgency.
We both stared into the darkness of her car. I could still see it, that faint movement, that unsettling presence. It reminded me of those old stories, the ones you hear on late-night radio, about someone hiding in the shadows. I didn’t know what it was, or what it wanted. But I knew one thing: I couldn’t leave her there. Not alone. Not with that… lurking in her car.
I told her to stay with me, and that I would call the police. I stayed with her until the police arrived, and made sure that she was safe. I still think about that night. I still see that shadow in the backseat. It makes you wonder, doesn’t it? How close we all are to… well, you know. Those stories. I hope that she is doing well. I also hope that I never see anything like that again.”