I read this after it was recommended on Radio 4's book club, and thought that it was generally pretty good. It was obviously well researched and the writing was engaging. My only complaint was that the story did not have enough substance to justify a book that is couple of hundred pages long. Initially, I really enjoyed the book, with its evocative descriptions of Victorian London - night soil men and all. However, the author soon began repeating himself and labouring certain points (I lose count of how many times he stated that Dr Snow and Rev Whitehead were mutually dependent on each other when it came to solving the problem of how cholera is transmitted - but it felt like too many!) My overall impression was that this story would have made a good article, but that it had insufficient depth to require a book of this length.