"Sherlock" is a British mini-series produced by the BBC. The first season was released in 2010, and the second season was released on January 1, 2012. Each season has three episodes, each episode is 90 minutes long. The protagonist Sherlock Holmes is a fictional detective character, a talented detective image created by Arthur Conan Doyle, a British detective novelist at the end of the 19th century. The play moves the time background of the original work from the 19th century to the 21st century, telling the story of a series of dangerous and unusual adventures experienced by the fashionable detective Sherlock Holmes and his right-hand assistant John Watson in the bustling metropolis of London.