The Valley of Fear

In the last of the Sherlock Holmes novels, the origins of his rivalry with Moriarty are revealed

In London, there is a professor whose income runs to a modest £700 a year, yet in his office hangs a painting worth no less than £40,000. The author of a rarefied mathematical treatise on the dynamics of asteroids, he has twenty different bank accounts and a priestly manner that belies his vicious nature. His name is Moriarty, and he sits at the center of a vast and invisible web of crime. Years...