Sherlock Holmes (Robert Downey, Jr..) and his longtime trusted associate, Dr. John Watson (Jude Law), take on Professor Moriarty (Jared Harris), with the help of Holmes's older brother Mycroft Holmes (Stephen Fry) and a Romani woman named Sim (Noomi Rapace).
- Robert Downey, Jr.. as Sherlock Holmes
- Jude Law as Dr. John Watson
- Jared Harris as Professor Moriarty
- Noomi Rapace as Sim
- Stephen Fry as Mycroft Holmes
- Kelly Reilly as Mary Morstan Watson
- Rachel McAdams as Irene Adler
- Eddie Marsan as Inspector Lestrade
- Geraldine James as Mrs. Hudson
- Fatima Adoum
- Gilles Lellouche
After the success of the first Sherlock Holmes, a sequel was fast tracked by Warner Bros. with director Guy Ritchie dropping out of an adaptation of Lobo and Robert Downey, Jr.. leaving Cowboys & Aliens. It was unclear if Rachel McAdams would appear in the film. McAdams said, "If I do, it won't be a very big thing. It's not a lead part". On 4 February 2011 Warner Bros.. confirmed to Entertainment Weekly that McAdams will play a part in the sequel.
The film is reported to be influenced by Conan Doyle's The Final Problem. While the film takes place a year after the events of the first film, Sherlock Holmes: A Game of Shadows is intended to be a stand-alone film that doesn't require knowledge of the previous film.
In October 2010, Robert Downey, Jr. and Jude Law were seen rehearsing a fight scene as shooting took place in Richmond Park, south-west London. In October 2010 steamship PS Waverley was chartered on the English Channel for filming, and a large green screen was erected at Didcot Railway Centre with a large action scene filmed there in mid-November. In late November, a scene was filmed at Victoria Bridge, which is part of the Severn Valley Railway. In January 2011 scenes were also filmed at Hampton Court Palace. Filming also took place in September 2011 in Greenwich at the Royal Naval College.
Early February 2011, principal photography moved for two days to Strasbourg, France. Shooting took place on, around and inside the Strasbourg Cathedral. The scene is said to be the opening scene of the movie, as it will cover an assassination/bombing in a German speaking town.
The film is scheduled to be released 16 December 2011 in the United States and United Kingdom and 25 December 2011 in other countries.