“The game is never over.” That’s what Sherlock Holmes tells his sidekick Dr Watson in the season 3 finale of the BBC crime series Sherlock. It’s also a promise made by the show’s creators, who revealed that there is more to come in this modern *adaptation of Arthur Conan Doyle’s masterpiece. But some of the most devoted Sherlock fans are already keeping the game going in their imagination, as they continue to churn out fan fiction based on the characters from the TV series.