Author
The Ghost Map
The Ghost Map reconstructs the severe cholera outbreak that struck London’s Soho district in late August and early September 1854. Steven Johnson organizes much of the central narrative chronologically, following the epidemic from its first households through the investigation of the Broad Street water pump. Physician John Snow supplies the analytical framework: already skeptical of the dominant belief that cholera traveled through foul air, he gathers addresses, water-use histories, mortality patterns, and exceptions that might support or undermine a waterborne explanation. The Reverend Henry Whitehead contributes a different but complementary form of knowledge—close familiarity with neighborhood residents and the willingness to conduct extensive household inquiries. Johnson presents their eventual collaboration as an example of formal analysis strengthened by local, social intelligence. The book then widens its scale. It examines Victorian waste disposal, overcrowding, water infrast…