New York proves itself both a jewel box and a fish tank of romance as Charles, Mabel and Oliver take their relationships to the next stage; dating can reveal many hidden secrets.
As he awaits his formal arraignment at Rikers Island, Naz realizes that his survival, or perhaps his demise, rests in the hands of a particular inmate.
A mysterious child who was living alone underground forms an unspoken bond with Olivia; a serial killer resurfaces.
When Mycroft returns to New York, his motivations cause problems between Joan and Sherlock; an investigation brings Sherlock and Watson to the world of unmanned aeronautics.
After a single mom is arrested for leaving her young daughter alone for days, Sgt. Benson suspects the woman may have been abused in her own childhood.