Just another GR refugee. Other than that, I had a stroke in 2004, and read almost anything I can get my hands on, though I have a particular weakness for history, mystery, and historical fiction.
Most of this book is a well-enough done examining of how Victorian London coped (or didn't cope) with disease epidemics. And how Dr. Snow tracked down the root of the cholera epidemic to the city's public water system, via an ingenious map.
But the last chapter, and its discussion of suitcase nuclear bombs, lost me entirely, and is the principal reason it doesn't get a higher rating.