Sherlock takes a case assigned by Moriarty to get answers about Irene Adler. Watson is the one to figure out the case while Gregson tries to convince her to leave Sherlock and be a sober companion for one of his friends. Watson worries about her safety but Holmes reassures her that he wouldn't let anything happen to her. In the final scene it is revealed that Irene Adler is alive.
Gregson: I've been a cop for 30 years, I carry a gun.
Watson: And a penis.
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