The Secret in My Husband's Study

I never imagined I'd discover such a secret in my husband's study. It was a gloomy, rainy afternoon. I was organizing the mountain of medical books in the study when I suddenly noticed something strange about the wall behind the bookshelf. There was an almost invisible crack in the wallpaper. I reached out and touched it, and heard a "click." The entire wall slowly slid open, revealing a downward staircase. My heart skipped a beat. Three years into our marriage, I had no idea there was such a hidden room in our home. A damp, musty smell wafted out. I fumbled for the light switch on the wall, and the dim, yellowish light gradually illuminated.