Every night, my mother-in-law would knock on our bedroom door at 3 a.m., so I set up a hidden camera to see what she was doing. When we saw her, we froze… Liam and I had been married for a little over a year. Our life together, in our quiet Boston home, was peaceful—except for one thing: his mother, Margaret. Every night, at exactly 3 a.m., she would knock on our bedroom door. Not loudly—just three slow, distinct knocks. Knock. Knock. Knock. Just enough to wake me up every time. At first, I thought maybe she needed help or was just a little lost in the dark. But every time I opened the door, the hallway was empty—dimly lit, completely silent. Liam told me not to worry. “Mom’s not sleeping well,” he would say. “He sometimes wanders around a bit at night.” But the more it happened, the more uneasy I felt. After almost a month, I decided to find out the truth. I bought a small camera and discreetly attached it to the top of our bedroom door. I didn’t say anything to Liam—he would have assured me I was exaggerating. That night, the knocking started again. Three soft, muffled taps. I pretended to be asleep, my heart pounding in my chest. The next morning, I started the recording. What I saw chilled me to the bone.

At last he sighed, in a trembling voice:
“Mother doesn’t want to disturb us. He has his reasons.

But he said no more. I, furious, announced that I would ask him directly.

In the living room, I spoke with Shanti. I told him about the camera, the video, everything. I asked bluntly,
“Why does she knock on the door every night? Why does she stand there?”

She put down the cup of tea. His icy eyes pierced me:
“What do you think I do?” he said in a voice so deep that I shuddered.

Then he got up and left me trembling.

That night I reviewed more recordings. I discovered something worse: after knocking, I would take a small key out of my pocket and put it in the lock. He didn’t turn it, he just left it for a few seconds and then left.

The next morning I checked Arjun’s drawer. I found an old notebook with a note:

“Mom wanders around at night. He says he hears noises in the house, but there’s nothing. He asks me not to worry, but I’m afraid he’s hiding something.”

Arjun, when discovered, confessed: after the death of his father, his mother developed an obsessive-compulsive disorder. I thought there was always an intruder, so I checked doors, including ours. Lately she has been whispering disturbing phrases: “Arjun must be protected from her.”