

The New York Times reviewed The Ghost Map, stating that there was "a great story here". Around the mid-1850s Snow figured out the source of cholera contamination to be the drinking water from the Broad Street pump. John Snow was a revered anesthetist who carried out epidemiological work in Soho, London. The two central figures are physician John Snow, who created a map of the cholera cases, and the Reverend Henry Whitehead, whose extensive knowledge of the local community helped determine the initial cause of the outbreak. The work covers the 1854 Broad Street cholera outbreak. It was released on 19 October 2006 through Riverhead.

The Ghost Map: The Story of London's Most Terrifying Epidemic – and How it Changed Science, Cities and the Modern World is a book by Steven Berlin Johnson in which he describes the most intense outbreak of cholera in Victorian London and centers on John Snow and Henry Whitehead.
