An original Sherlock Holmes novel from acclaimed New York Times best-selling author. Holmes and his faithful companion Dr. Watson are about to embark on one of their strangest and most exhilarating adventures yet. 

It's the autumn of 1890, and a spate of bombings has hit London. The newspapers are full of fevered speculation about anarchists, anti-monarchists and Fenians. But one man suspects an even more sinister hand behind the violence.