After a graduate student developing an electromagnetic weapon for the Navy is attacked, the NCIS team discovers a connection to international warfare. Also, Kensi continues grueling physical therapy for her spinal injury.

After an unknown female assailant kills two men disguised as Sherriff's deputies in front of Callen's home, the NCIS team gets a new lead in the ongoing mole investigation. Also, Nell visits a prison to interview an inmate withholding information on the department's leak.