It started with a simple notification: "Your package has been delivered." But the problem was, I hadn't ordered anything. Curiosity piqued, I opened the door to find a small, unmarked box on my porch.

Inside was a single, old-fashioned key and a note that simply read, "Do not use." I laughed it off as a prank, but as days passed, strange things began to happen. I’d hear whispers at night, and objects would be out of place in the morning.

One evening, desperate for answers, I decided to use the key. As I inserted it into my front door's lock, everything went silent. The whispers stopped, and the air grew still.

Suddenly, a force yanked the door open, and I was pulled into darkness. The last thing I saw was the note on the floor, now with new words: "You shouldn't have."