Immigrant mother, Lourdes, works as a cleaning woman at an old New York City restaurant in order to make enough money to pay for her sick son's operation. With no friends or family, she lives a lonely, desperate existence, saving every penny and sending it home for her son. As his condition worsens malevolent forces living within the walls of the restaurant begin to torment her. She struggles to escape, and return to her son before the evil within the dark walls drives her completely mad.