Sean Dougherty

Elizabeth and President Dalton discover a secret that could impact Maria Ostrov's reputation; Dmitri wants to stop being a spy.

Sherlock takes a case from a man that claims he is Moriarty, in the hope that it will bring him closer to finding his nemesis; Gregson suggests that Watson give up the line of work she has chosen and go back to being a sober companion.

Alicia tries to hold a website accountable when its users accuse a college professor of being linked to domestic terrorism. Meanwhile, Will goes against Diane's wishes when he hires Damian Boyle.

After being freed from her confinement to the psych ward, Root needs Shaw's help with a directive from the machine; Finch and Reese look into a mild-mannered investigator.