Castle goes undercover at an elementary school to find the second-grader who may possess information about the shooting of an ice cream vendor.
While Phillip is busy cleaning up after their last mission and Elizabeth tries to reassure Martha, the couple are assigned a replacement handler. At the KGB, Arkady and Oleg disagree how to handle things and the FBI assigns Stan to find a missing scientist.moreless
An old comrade visits Elizabeth and Phillip, resulting in them embarking on a rogue mission. Meanwhile, tensions increase both at the Rezidentura and the FBI.
Against orders from Homeland Security, the NCIS team continues their manhunt for the elusive Bodnar.