Robert Downey Jr. and Jude Law reprise their roles as Holmes and Watson. While vying with Watson's soon-to-be wife for the Doctor's time and attention, the detective extraordinaire matches wits with his arch-nemesis Professor Moriarty, a criminal genius who's conspiring to make a fortune by manufacturing the next generation of wartime weaponry that the world's great powers will be forced to use against one another... once Moriarty succeeds in provoking World War I, of course. Starring Robert Downey Jr., Jude Law, Noomi Rapace, Jared Harris, Stephen Fry.