Sean Dougherty

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.

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

An executive of a body armour company is gunned down upon arrival at his daughter's $2 million sweet-16 party, and the incident may be linked to a US soldier killed in Iraq when his vest failed.

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.