These days we kind of assume that police are a normal part of law and order. But that wasn't always the case. In fact, it wasn't the case for a lot of human history. So how did we start thinking of police as a natural part of a city? It all starts in London with the Thief-Taker General Jonathan Wilde, a man of two faces. Which one is real: valiant crime fighter or the puppet master of London's underbelly?