The body of a doctor is found in a park in D.C. and the NCIS Major Case Response Team are summoned to the scene to investigate. It appears to be a normal investigation but things change when Director Vance arrives at the crime scene and informs that the team that the killer they're looking for is someone he's been hunting down for the last twenty years....
In the bullpen, as photos of Lee Wuan Kai grace the monitor, McGee reading from a file reveals that Lee Wuan Kai who is a North Korean assassin and one time fanatical nationalist has been credited with 27 targeted hits in seven countries and dozens more by associate.
A nurse who had threatened the life of the doctor who is the initial victim (the one whose killing tips Vance off to Kai's presence). She shoots at McGee and DiNozzo with a shotgun, thinking the doctor sent them, is arrested and interrogated but cleared.