I came home for Christmas after twelve years, and my sister greeted me with a lie: “Mom and Dad went on a trip.” I didn’t confront her, but after finding my father’s broken glasses, their bedroom locked, and hearing three faint knocks beneath the kitchen floor, I realized my parents might never have left that house at all.

I walked back into the house through the mudroom, wiping the snow off my boots before Brenda could catch me.

She was sitting in the dimly lit living room, a glass of red wine in her hand, staring at the glowing screen of a laptop. As soon as I walked in, she snapped the laptop screen shut with a loud click and set it on the coffee table.

"You took your time getting your bag," she said, her eyes narrowing as she studied my wet pant legs.

"I was admiring Dad's old woodshop in the dark," I lied smoothly, picking up my duffel bag from the foyer floor. "Brings back a lot of memories."

"Well, don't go wandering around in the dark," she snapped. "The property isn't safe at night. There are deep drainage ditches near the treeline."

"Right," I said. "I'm going to turn in early, Brenda. Long drive."

"Good night, Shawn," she said, picking up her wine glass without looking at me again.

I went upstairs to my old bedroom, closed the wooden door, and sat on the edge of the twin bed. I didn't take off my clothes. I sat in the dark, wearing my heavy sweater and jeans, listening to the rhythmic, hollow ticking of the tall pendulum clock sitting in the hallway downstairs.

Hours dragged by.

At 11:30 p.m., I heard Brenda's heavy steps come up the stairs. I heard her footsteps pause outside my room for nearly two full minutes. I kept my breathing slow and steady, pretending to be fast asleep. Finally, her footsteps moved down the carpeted hallway toward the guest room at the front of the house. A door closed, and a lock clicked into place.

The house fell into a terrifying, heavy silence.

I sat there in the pitch black, staring at the green illuminated numbers of my digital wrist watch.

12:00 a.m. 1:00 a.m. 2:00 a.m.

At precisely 2:07 a.m., a sound shattered the quiet.

It wasn't the creaking of the old timbers under the weight of the freezing wind outside. It wasn't the hum of the old refrigerator.

Knock.

I froze, my entire body going rigid on the mattress. My eyes snapped wide open, staring at the dark ceiling.

I waited, my heart pounding so hard I could hear the blood rushing in my ears.

Ten seconds passed.

Knock.

It was a dull, heavy, muffled sound—a hollow impact against thick wood or concrete.

I slowly slid my legs off the bed, making sure my boots made no sound against the rag rug. I crept toward my bedroom door, turned the brass knob inch by inch, and slipped out into the freezing hallway.

The house was bathed in long, jagged shadows cast by the moonlight filtering through the stairwell window.

I tiptoed down the stairs, skipping the third and seventh steps—the two steps I knew from childhood that creaked like rusty hinges. I reached the bottom landing and stood in the dark foyer.

Knock.

The sound didn't come from upstairs. It didn't come from the master bedroom.

It came from below my feet.

I moved into the dark kitchen, my heart hammering like a trapped bird against my ribs. The air down here was distinctly colder, carrying that sour, stagnant odor I had noticed when I first arrived.

I dropped to my knees in the center of the kitchen floor, right beside the wooden island, and pressed my right ear flat against the cold pine floorboards.

Silence.

I held my breath, closing my eyes, every nerve in my body strained to the limit.

Then, from deep beneath the floorboards, through inches of subflooring, joists, and concrete, came three agonizingly weak, rhythmic strikes:

Knock. Knock. Knock.

My eyes flew open in pure, unadulterated horror.

Someone was alive underneath the house.

I scrambled up from the floor, turning slowly toward the far wall of the kitchen. There, half-hidden behind a tall wooden pantry, was the narrow door that led down into the stone basement.

I stepped toward it. Hanging from the heavy iron door latch was a thick, brand-new steel padlock, its polished brass cylinder gleaming in the moonlight.

And then, behind me, a floorboard creaked loudly in the hallway doorway.