After receiving information from Sebastian Moran (Vinnie Jones), Sherlock resumes his search for Moriarty.
Lucca defends a TV writer-producer in a copyright infringement case with ties to the President of the United States; Mike Kresteva takes aim at Reddick, Boseman & Kolstad.
Mayor Buddy Gray asks Tommy to personally oversee the investigation when a Hollywood producer is attacked during a party at his home by a woman who claims he tried to sexually assault her first. Also, Tommy prepares for the LAPD recertification process to demonstrate her fitness for her position.
Curtis and Briscoe's investigation into the death of a horse leads to a killer who may target more than animals.