With Mrs. McCluskey's house completely destroyed, Lynette faces the possibility that her family and Ida Greenberg may not have survived; Katherine finds out that someone knows the truth about her mysterious past.
Hetty turns in retirement papers and disappears; Sam insists that Callen find a new partner.
The team must find assailants who illegally crossed the border and attacked patrolmen.
The team tracks a highly skilled assailant determined to kill a Brazilian diplomat.
