Sherlock Holmes: A Game of Shadows is a 2011 British-American action mystery film directed by Guy Ritchie and produced by Joel Silver, Lionel Wigram, Susan Downey, and Dan Lin. It is a sequel to the 2009 film Sherlock Holmes, based on the character of the same name created by Sir Arthur Conan Doyle. The screenplay is by Kieran Mulroney and Michele Mulroney. Robert Downey, Jr. and Jude Law reprise their roles as Sherlock Holmes and Dr. John Watson, respectively, as the duo join forces to outwit and bring down their most cunning adversary, Professor Moriarty, played by Jared Harris.