Four great cities; four incredible crime stories. In each city a different Mob; a unique history. Through dramatic first hand testimony Underworld lifts the lid on key events in organized crime history of four North American cities: Miami, Philadelphia, Las Vegas, and Montreal. Underworld reveals what the real Miami Vice was like; how the Philadelphia Mob came to bust itself; why the Mafia built Las Vegas; and how Mobsters and Bikers forged an unholy alliance to rule the streets of Montreal.