"It's getting late. I want to share my knowledge of London with you, if I can remember any of it." So says Mr. Arthur Bryant. He and John May are the nation's oldest serving detectives. Who better to reveal its secrets? Why does this rainy, cold, gray city capture so many imaginations? Could its very unreliability hold the key to its longevity? The detectives are joined by their boss, Raymond Land, and some of their most disreputable friends, each an argumentative and unreliable expert in their own dodgy field. Each character gives us a short tour of odd buildings, odder characters, lost venues, forgotten disasters, confusing routes, dubious gossip, illicit pleasures, and hidden pubs. They make all sorts of connections and show us why it's almost impossible to separate fact from fiction in London.