Following an active shooter lockdown at a naval hospital, the NCIS team searches for a suspect who fled the scene. Also, someone from Sloane's past was inside the hospital and is a key witness in the case.

After entering cold case DNA into the system, Kasie solves a 30-year-old murder case, but a loophole in the legal system may set the suspect free. Also, McGee visits an elite technology company in Silicon Valley that is offering him a highly paid position.