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When PhD student Ellen MacKenzie unearths a lost Sherlock Holmes manuscript at Cambridge, she reveals a hidden history where fiction and medical science collide. In 1854 London, the legendary detective joins forces with the historical Dr. John Snow to combat a terrifying cholera outbreak. Navigating the stench of Soho and the skepticism of the medical establishment, Holmes and Watson encounter figures like Florence Nightingale and Reverend Henry Whitehead as they race to prove the disease is waterborne. This atmospheric mystery blends meticulous Victorian detail with a modern frame, exploring the grueling struggle for scientific truth against institutional ignorance and the haunting legacy of the Broad Street pump. Comparable works include The Ghost Map by Steven Johnson