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A serial killer is back at again after 13 years away, Sherlock tracks him down and figures out that the killer had a partner and it was his son. Holmes also discovers that Captain Gregson's old partner planted evidence to put the killer away. Watson goes a hunt to figure out who Irene Adler is and finds a series of letters that Sherlock wants nothing to do with. Holmes confesses that Irene Adler had died and he took it extremely hard.