It’s written as journal entries by a woman who may or may not have been insane before she got locked in an asylum or possibly just a room in her house by her husband. There’s a woman in the wallpaper who creepily crawls along the wall but actually it’s her shadow because she’s the creepy woman crawling around the room and rubbing up against the wall. Of course you don’t really know this until she starts really sounding crazy and starts ripping up the wallpaper trying to free the woman in the walls. In the end her husband returns home and either he faints or she fucking murders him with the blade she uses to sharpen her pencil. The book ends with her thinking she’s been freed, not by escaping through the now unlocked door but by entering the yellow wallpaper. There’s also a creepy film adaptation we watched that was… unsettling.