The Snapchat

It started with a snap.

Lena was alone in her apartment on a stormy Thursday night, scrolling aimlessly through Snapchat. She wasn't expecting any messages - most of her friends were out partying or asleep. But then, a new snap popped up from someone named "0nlyU".

She didn't recognize the username. No Bitmoji. No mutual friends.

Curious, she opened it.

It was a blurry photo of her - taken from outside her bedroom window. She gasped and spun around, but there was no one outside. Just rain tapping the glass.

She snapped back:

"Who is this?"

Almost instantly, another snap arrived. It was a video now. Shaky, dark footage, slowly zooming in? on her front door. Then?

Knocking.

At that exact moment, there was a real knock at her door.

Frozen, heart pounding, she backed away. Another snap came in. A photo this time - of her inside her apartment, standing by her couch, staring at her phone. Taken from behind.

She bolted for her bedroom, locking the door. Dialed 911. Hands trembling.

Before she could press call, her phone buzzed again. One final snap. A pitch-black screen. With a caption:

"Why call them? I'm already inside."

The last thing she heard was the soft click of her bedroom door unlocking.

And the snap of a camera.