On the eve of the wedding, a tipsy Barney wanders out of the hotel, bumps into two hapless young men and takes them under his wing.
The team race to find the vigilantes responsible for a number of attacks happening every 27 minutes. Prentiss and Unit Chief Andrew Mendoza head the investigation to identify the perpetrators.
A nefarious virus is uploaded to Walter's computer, turning the team's new 'smart' building project into a death trap with people locked inside.
After a 50-year-old tape recording left by a murder victim is found, the NCIS team tries to exonerate Ray Jennings, the Marine serving a life sentence for the crime.
Jane and Maura enter the high stakes world of competitive bass fishing when a leading fisherman dies during a tournament.