Co-creator Mark Gatiss played Mycroft Holmes, Sherlock's mysterious sibling ... the vibrant and bustling atmosphere of London's Chinatown served as a backdrop for Sherlock's investigations.

When Sherlock Holmes stepped out of the door of 221b ... an obsessive copper whose internal turmoil is reflected in the stark London backdrop his cases are set against. For cities to become ...

With contemporary London as its backdrop, the series is a modern adaptation of the Sherlock Holmes stories, with the 2016 special being set in Victorian London as an homage to the original.