Holmes and Watson lead a manhunt for a blackmailer targeting the families of rape victims. Sherlock refuses to celebrate reaching a year of sobriety.
Reese and Finch are sent to a wedding to protect a pair of POIs. Fusco takes it upon himself to investigate a series of missing person reports.
When Naz's parents arrive at the station, Detective Box finds a way to use them to his advantage.
Philip and Elizabeth struggle to contain the risks from Paige's growing relationship with Matthew Beeman, and the Centre sends Philip and Elizabeth on an operation that strains their family and marriage to the limits.
Having revealed their true identities to their daughter Paige, Philip and Elizabeth must keep her best interests at heart while ensuring that they remain protected.