Erika wakes up terribly confused and not knowing where she is. She is tied to a chair in a dark room with only the pale light of a lamp and the sound of a subway train in the background. She is terribly scared. As time goes by, she increases her pain and also her uncertainty. She falls into a delusion that is prolonged by her reflections on her life of prostitution and the bad life she gave her daughter. After some intense internal drama, she finally finds a way to break free of her, but she doesn't know what's on the other side of the door.