The Hollow Signal

I never told anyone about the knocking at first. Not even Lena, and I told her almost everything. It started three years ago, right after we moved into that old farmhouse on the edge of the marsh. My room was at the end of the upstairs hallway, a narrow box with a window that looked out over the reeds. The first time I heard it, I was lying on my bed, reading a book about local folklore. The sound was crisp, deliberate: three knocks, a pause, then two more. It came from the wall directly above my headboard, about a foot to the left of the window. It was so close I could feel the vibrations through the pillow.

I froze, my heart hammering. I lived alone then—my grandfather had just passed and left me the place. The nearest neighbor was a half-mile down the dirt road. I told myself it was the house settling, or maybe a bird pecking at the siding. But the sound was too precise, too clear, like someone was standing on my side of the wall, tapping their knuckles against the plaster. When I finally worked up the courage to check, there was nothing on the other side but the empty space between my room and the bathroom.

A week later, it happened again. Same pattern, same spot. I was on my laptop, headphones on, and I still heard it above the music. This time, I jumped up and pressed my ear to the wall. The knocking stopped, but I could hear a faint, rhythmic hum, like a distant engine idling. I put my hand on the plaster and felt a slight warmth, as if the sun had been beating on it all day—but it was night, and the window was cold. I opened the window and leaned out, expecting to see a branch or an animal. The marsh stretched dark and silent, the only sound the chirping of frogs. The wall was smooth, unremarkable. No branches, no wires, no vents. I chalked it up to my imagination and tried to forget it.

But it kept happening. Every few nights, always when I was in bed, always from that exact spot. The pattern varied—sometimes a single knock, sometimes a rapid tattoo—but it never moved. I started to dread going to sleep, lying awake, staring at the wall, waiting for the sound. I tried covering the spot with a poster, but the knocking seemed louder through the paper. I tried sleeping on the couch, but the sound followed me there, now coming from the ceiling above the TV. It was as if the signal was meant for me, and whatever made it was growing restless.

I began to investigate the house’s history. The old records showed it was built in the 1920s by a man named Ezra Hollis, a recluse who had a reputation for dabbling in things he shouldn’t. He built the house near the marsh, which locals whispered was a doorway to something else. The property had changed hands several times, and each owner reported strange occurrences—doors slamming, cold spots, and a persistent knocking in the walls. Some said it was a ghost, others said it was a malevolent spirit tied to the land. I tried to rationalize it, but deep down I knew it was real.

One night, I decided to confront it. I set up a voice recorder and a camera on a tripod, pointing at the wall. I sat cross-legged on the bed, facing the spot, and called out, ‘Who are you?’ The room was silent. Then, the knocking began—slow, deliberate, as if answering my question. I asked again, and it responded with a sequence that I later played back in slow motion. It wasn’t random. It was a rhythm, like a heartbeat with an irregular beat. I felt a chill run down my spine. I had the irrational thought that it was tapping out my own pulse, and that the irregularity was a sign of something wrong.

That night, I had a dream. I was standing in the marsh, waist-deep in black water, and the knocking was coming from beneath the surface—a deep, resonant thump that made the water ripple. I walked toward the sound, and the reeds parted, revealing a sunken foundation of an old structure, half-buried in mud. There was a door, slightly ajar, and from it came the knocking. I pushed the door open and saw a room, identical to mine, but inverted—the window on the opposite wall, the bed against the other side. In the center stood a figure, featureless, made of shadow, and it was knocking on the wall, facing me. It spoke in a voice like gravel and static, ‘You are the echo.’ I woke up drenched in sweat.

I couldn’t shake the dream. I decided to search the marsh for the foundation, but the area was vast and treacherous. After days of searching, I found it—a collapsed structure, barely visible among the cattails. The door was exactly as I’d seen it, rotted and broken. I stepped inside, and the air was thick with decay. The walls were covered in strange symbols, carved deep into the wood. I ran my fingers over them, and they felt warm. Then, from the back of the structure, I heard it: the knocking, clear and urgent. I walked toward it, my heart racing. In a small alcove, I found an old radio, its wires frayed, its dials rusted. It was tuned to an unknown frequency, and every few seconds, it emitted a burst of static that matched the rhythm of the knocking.

I realized then that the knocking wasn’t a ghost or a spirit. It was a signal—a message from something that lived in the marsh, using the house as a receiver. I took the radio home, and I’ve been trying to decode it ever since. The frequency shifts, the pattern always the same. Sometimes I think I hear my name in the static, but I can’t be sure. The knocking has stopped, but now I hear it in my dreams, and I know it’s only a matter of time before it finds a way through. The marsh holds secrets, and I’ve only scratched the surface. I just hope I can understand before it’s too late, before the echo becomes the real thing.