Sherlock-o-philes, are you enjoying the replay of season 4? Good—we thought so! In tonight's episode, written by Steven Moffat, Sherlock faces perhaps the most chilling enemy of his long career: the powerful and seemingly unassailable Culverton Smith—a man with a very dark secret.
Watch Sherlock: The Lying Detective on WGBH’s Masterpiece, tonight at Xpm on WGBH 2.
