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When Cambridge graduate student Ellen MacKenzie discovers a wandering manuscript attributed to Arthur Conan Doyle, she uncovers a lost case that bridges the gap between Victorian tragedy and modern archival rebellion. The narrative shifts to 1890s London, where Sherlock Holmes and Dr. Watson investigate a series of mysterious illnesses linked to industrialist Nathaniel Burnham. What begins as a suspected case of sabotage evolves into a chilling exposure of 'phossy jaw,' arsenic-laced wallpaper, and systemic corporate negligence. As Holmes deciphers the chemical signatures of death in the slums of Bow and Kensington, he finds himself pitted against a foe more resilient than any criminal mastermind: the cold arithmetic of industrial greed. In the present day, Ellen must decide whether to suppress these uncomfortable historical truths or risk her career to digitize a legacy of resistance. This atmospheric mystery blends meticulous Victorian forensic science with a modern exploration of institutional accountability, revealing that the deadliest toxins are often those embedded in the fabric of society itself. Comparable works include The Seven-Per-Cent Solution