"He was at once a fence for stolen articles and a spy for the police. He worked a thriving trade both ways, because the district on which he bordered was the Maze, a tangle of muddy, winding alleys and sordid dens, frequented by the bolder thieves in the kingdom."
Welcome to the Narrows. No-one's coming to save you.
—Joker, The Joker Blogs
Martha: You've brought me to the slums?
Doctor: Much more interesting! It's all cocktails and glitter up there; this is the real city.
— Doctor Who, "Gridlock"