The search for the bombs continues, as the team work to rescue Sam and Deeks, and keep Michelle safe.

An aircraft crashes in Burbank, killing all aboard. At first it appears the pilot inexplicably flew straight into the runway, but as the team investigates they find evidence of murder. Nate returns to evaluate Sam and Deeks.

Deeks returns; in LA the CEO of a biotech firm dies in an explosion of his car; the firm does research for a vaccine against the deadly ricin virus; the G team figure out the bombing and a theft by extortion, and they catch the bad guys.

Someone abducts a German immigrant man; Hetty sends G to Camp Pendleton; everyone else on the team starts working on the abduction; G tails them and joins them; Arkady lends a hand; the gang figure out some of it, and Hetty tells the rest.

When a security guard at a railyard is killed, the team are sent to investigate a possible terrorist plot.

A lieutenant commander in Naval intelligence dies at an upscale addiction-rehab villa in Malibu, near Los Angeles; Kensi and Deeks go undercover at the spa; Eric and Nell give much help; the team solve the case and prevent a major tragedy.

A masked intruder decapitates a Pentagon consultant in Bahrain and steals a flash drive containing top-secret data; the drive turns up in Hollywood; a Gurkha works with the team; they find the answers and eventually the drive as well.

The team search for a Romanian suspected war criminal and human trafficker after he escapes the FBI's attempts to capture him.

Callen and Sam protect a Senator's daughter after an attempted kidnapping, while Deeks and his temporary partner track down her attacker.

A man dies in an explosion of his car; he's an undercover agent of the US Department of the Treasury, who investigated an ancient Middle Eastern technique for anonymous transfers of funds; the team solve the puzzle and prevent a tragedy.

Two dead bodies show up in an alley; the LAPD calls the G team; the vics were former military and former employees of the private contracting firm linked to a previous story; Nell goes into the field and does well; the team solve the case.

A stranger arrives at the Equatorial Guinea Consulate claiming to know of a plan to kill their President in 24 hours.

At a fish market in LA an explosion kills two employees and necessitates a partnership with a DEA Agent.

In LA a local gang torture and execute an ATF undercover agent, who worked with the US Navy on a joint task force; G and Sam find the body and a clue, which leads to a club, where the team solve the case, find a leak, and take care of it.

While Eric and a buddy, Ira, play an online game, a sniper opens fire on Ira's pad, and thugs break in; the G team look into security involving Russia and Chechnyan separatists; the team safely work out everything. Kensi remains in trouble.

Hetty, suspecting that Kensi has become a prisoner of Taliban insurgents, sends G, Sam, and Deeks to aid her; G, Sam, and Granger overcome trouble and find Kensi and another; Deeks produces help; all works out; the gang prepare to go home.

In LA two Iraqis demand money from a discharged Marine, who's also a former security contractor from Iraq and a recently released federal prisoner; the Callen team find surprises, explanations, and bad guys; Kensi returns to field work.

G and Sam abduct an undercover NCIS agent suspected of having turned to the side of the smuggler whom he's investigated; Kensi and Deeks play head games with the agent, G and Sam play them with the suspect, and the teams win on all counts.

At an avionics firm in LA four armed thugs steal a flash drive containing software pertaining to a drone for the US Navy; Sam knows the lead engineer on the drone project; the G team figure out everything and find the bad guys and a child.

While investing the death of a missing submarine officer, which first resembles a suicide, the G team find conflicting clues and other evidence; G and Sam discover a distinctive vessel, they board it, and it gets underway. [Continued.]