The past came back to bite Sherlock in a big way in Elementary Season 4 Episode 23, with Moriarty's organization on offense. Read on for details!
In a bit of a bait-and-switch, Sherlock revealed very quickly at the start of this episode that Jamie Moriarty was not involved in the web of conspiracy around the assassination attempt on Morland Holmes. Her organization, however, was.
In Elementary Season 4 Episode 23, our intrepid detective was faced with the fallout of his failure to fully dismantle her extensive criminal enterprises after her arrest several seasons before.