I am thirty years old and live in a quiet neighborhood where everyone knows each other and keeps an eye on unusual activities. My neighbor Dorothy is eighty years old and has been a central figure in my life since my childhood when she used to watch over me and tell me captivating stories while my mother ran errands. As she grew older and household chores became more difficult for her, I naturally took it upon myself to help her with groceries, minor repairs, and regular visits just to chat. It felt like a small way to repay the kindness she had shown my family for so many years. However, my routine visits took a strange turn when Dorothy suddenly asked me to stop coming around so often, claiming she had found companionship with a young delivery driver named Alex. She mentioned they had fallen in love, which I initially brushed off as a playful joke given the massive age gap between them. But my amusement quickly faded into genuine concern when I started seeing this young man wearing ordinary clothes and carrying a cheap backpack entering and leaving her home regularly. Soon after, he even had his own key and walked in with the absolute familiarity of a permanent resident, leaving me with a deep sense of uneasiness about his true intentions.
Over the following couple of weeks, my worries intensified as Dorothy seemingly vanished from her own life. She stopped spending time in her garden, abandoned her usual daily walks, and completely stopped answering my phone calls. Instead of the lengthy, detailed, and cheerful text messages she usually sent about her meals or the local weather, I began receiving brief, robotic replies assuring me she was fine and that Alex was helping her. These messages felt incredibly unnatural and pre-written, convincing me that something was terribly wrong in that house. My anxiety peaked one afternoon when a package meant for Dorothy was accidentally delivered to my porch, prompting me to walk next door and knock loudly on her front door. When nobody answered and my calls went straight to voicemail, I grabbed the emergency key she had entrusted to me years ago for a situation exactly like this. Stepping inside, I found her house immaculately clean with no signs of a struggle, but both Dorothy and Alex were nowhere to be seen. As I stood in the silent house, I heard a faint, rhythmic knocking sound coming from beneath the floorboards, which sent a chill down my spine and pushed me to cautiously make my way down the poorly lit basement staircase.