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Airs: Thursday, May 16 at 9/8c
Get ready to finally meet Moriarty! "It comes to our attention he may be operating in New York," executive producer Rob Doherty says. And he's not the only legendary Sherlock Holmes character popping up: The two-hour finale also features the appearance of Sherlock's former lover Irene Adler (Natalie Dormer), whose courtship with the intrepid investigator will be explored through flashbacks that expose Sherlock's downward spiral into addiction. Plus: Another man in Moriarty's employ will unlock some shocking revelations.