21 parts Complete Post-season 3 of Sherlock BBC. Two years ago, Sherlock Holmes faked his suicide and has since gone back to his old life at Baker St. When the mysterious Irene Adler returns, the man is faced with his greatest challenge yet; the possibility of love. As an old foe returns, Sherlock, John and Irene must cooperate to survive. This time, however, the stakes might be too high even for Sherlock Holmes.