Mycroft asks Sherlock to move to London, but before deciding whether to stay or go Sherlock has one last case to investigate. The genius sleuth looks into the murder of a beautiful young woman.
An old friend's heart problems reveal a bigger issue than anticipated; Devon treats a suicidal woman whom he thinks might be a good candidate for deep brain stimulation; Billie and Trevor have an emotional reunion.
Elizabeth battles a US governor over a new policy of separating unauthorized immigrants from their children.
When a virus causes the machine to malfunction, numbers are issued irregularly; the team searches for an extremely elusive tech millionaire.
The return of The Freelancer unveils a conspiracy involving a local photographer; Ressler hits a personal milestone.