A mole hunt within the KGB causes suspicion amongst allies and shatters trust within the Jennings' marriage, meanwhile Stan's plan to keep his mole safe puts her at even greater risk of discovery.
Erin and Anthony clash when Anthony's daughter is the sole eyewitness to a fatal shooting; Frank wants to punish an off-duty copy for his inaction during an armed robbery; Danny and Baez investigate a violent mugging.
Bull helps his friend mount a diminished capacity defence for a sergeant accused of killing a fellow soldier; a French gallery owner needs legal assistance to stop an auction house from selling a piece of art that should be repatriated.
When the matriarch of one of New York's wealthiest families dies, the family demands answers. Also, memories brought on by the case torment Henry.