As of December 2015, the fourth season of “Sherlock” is expected to air in 2017. The exact date is not yet announced. A special episode airs on Jan. 1, 2016. The special episode is a standalone episode and is independent of the actual series plot.
Mark Gatiss and Steven Moffat created the British crime drama, "Sherlock. The series is a contemporary adaptation of the detective series “Sherlock Holmes” created by Sir Arthur Conan Doyle. Benedict Cumberbatch stars in the title role, and Martin Freeman plays Doctor John Watson. As of December 2015, nine episodes, across three seasons, have aired. The series has won numerous awards, including BAFTA, British Academy Television Craft Awards, Critics' Choice Television Award, Emmys and a Golden Globe Award.