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It started with a sound. Not loud. Just… a faint knocking from the wall. At first, you thought it was a neighbor. Maybe someone moving furniture late at night. But then it came again. Three short knocks. A pause. Then three more. You checked the time. 3:17 AM. The same as last night. You walked closer and pressed your ear against the wall. Silence. Then… a whisper. Not from the room. From inside the wall. “Let me out…” You froze. Your apartment is on the top floor. No one above you. A