When Lucifer escapes from the Cage, Sam, Dean, and Castiel find themselves in London seeking the help of Sherlock Holmes and Doctor John Watson to save the world from a cataclysmic battle between God and the Devil. Sherlock/Supernatural crossover
Rated: M - English - Supernatural/Friendship - Chapters: 9 - Words: 17,264 - Reviews: 71 - Favs: 88 - Follows: 129 - Updated: 6/2/2011 - Published: 2/23/2011 - Castiel, Sherlock H.