Every morning, my neighbor Evelyn dragged three, four, sometimes five enormous trash bags to the curb of our quiet Oak Park street. One day, I finally looked inside. I really wish I hadn’t.

Wednesday afternoon brought a heavy, gray downpour that lashed against the windows of Oak Park.

At 2:15 PM, Evelyn stepped out of her front door, clutching a large golf umbrella. She walked briskly to her SUV, started the engine, and pulled out of the driveway. According to her usual routine, Wednesday afternoons were reserved for her three-hour trip to the regional grocery hub and pharmacy two towns over.

It was now or never.

"Are you sure about this, Mark?" Sarah asked, her hands trembling as she held a small walkie-talkie. She was standing by our living room window, acting as my lookout. "If she comes back early, or if those men return..."

"Keep your eyes on the street," I said, zipping up my dark raincoat and grabbing a small pocket flashlight and a set of lock picks I'd purchased years ago for hobby crafting. "If you see a black van or her SUV, hit the talk button twice. I'll get out immediately."

I slipped out through our back door, staying low against the wooden fence dividing our properties. Rain poured down my neck as I navigated the slick grass, making my way to Evelyn's back patio.

The back sliding door was locked tight. I moved around to the side basement window wells. They were covered by thick decorative iron grates, but as I crouched down to examine the second window, I noticed something odd.

The iron grate wasn't bolted into the foundation. It was resting loosely over the well, held in place by two flimsy plastic ties.

I pulled a pocket knife from my jacket, sliced through the plastic ties, and lifted the heavy iron grate away. The window beneath was a small, horizontal hopper window. I pressed my palm against the glass and pushed gently.

With a soft click, the latch gave way. Evelyn had left it unlocked.

I took a deep breath, slid my legs through the narrow opening first, and dropped down into the dark basement below.

The air inside smelled overwhelmingly of industrial bleach, damp concrete, and something metallic that made my throat burn. It was freezing cold.

I clicked on my penlight, shielding the beam with my fingers as I looked around.

The basement wasn't an ordinary storage space. The concrete walls had been fitted with thick sheets of dark, soundproofing foam. Heavy electrical cables snaked across the ceiling, feeding into a large backup generator resting in the corner.

I crept quietly across the floor, my rubber-soled boots making no sound against the sealed concrete.

At the far end of the basement stood a heavy steel door—the kind you’d expect to see on a bank vault or a commercial freezer. Beside the frame was a digital keypad glowing with a faint blue light.

My heart hammered in my chest. I took a step closer, shining my flashlight on the door frame.

Suddenly, a faint, metallic thumping sound came from the other side of the steel door.

Thump. Thump. Thump.

Then came a voice—weak, raspy, barely louder than a whisper, passing through the small ventilation grate near the top of the frame.