June, 1916. With a world war raging on the continent, exhausted John H. Watson, M.D. is operating on the wounded full-time when his labors are interrupted by a knock on his door, revealing Sherlock Holmes, with a black eye, a missing tooth and a cracked rib. The story he has to tell will set in motion a series of world-changing events in the most consequential case of the detective's career.
Amid rebellion in Ireland and revolution in Russia,...