Having not heard anything from Ziva, Gibbs, Tony, McGee, and Abby wonder; each starts sniffing and digging; they trace her to Somalia. Gibbs, Tony, and McGee go there; Tony and McGee become caught; Gibbs springs them all; they all go home. Three men die during what they called a bachelor party; one was a Marine staff sergeant; Gibbs and company investigate. The clues lead to a cop, who later dies. The gang find the pieces and put them together; Ziva rejoins the team. A critic of the NCIS has severely complained about an alleged cover-up of the death of a Naval officer; the griper falls to his death; both the NCIS and the Metro PD investigate; the Gibbs team figure it out. Ziva seeks Gibbs’s signature. The body of a UA Marine, last aboard a ship with Ziva, turns up in a shrimping net in the Indian Ocean. Vance flags Ziva’s application while he questions her.
Mossad and more bodies appear. Ziva and Abby tell all. Gibbs puts Ziva to work. A Marine, a practical joker, dies, apparently by suicide by carbon monoxide; Gibbs and company investigate; Ducky rules out suicide, and Abby confirms. Tony starts to arrest the widow, but Gibbs stops him. The gang put the pieces together. Gibbs’s boat, which he gave to Franks, drifts, with two bodies aboard, into the Naval Station at San Diego. Vance and the team investigate. Franks and two relatives show up at Gibbs’s house. The gang solve the case and make an arrest. Two runners at the US Naval Academy find an unattended car and the body of a civilian physician; Gibbs and company investigate; Vance recognizes the MO of a North Korean woman assassin. The gang find the pieces, and everything works out. A woman Naval officer dies during a break-in at an ISP facility in or near Washington, DC, then electric power goes down throughout the entire metro area; Gibbs and company investigate in the dark; they solve the case and grab the bad guy.
A dead Marine’s day job at a government think tank leads Gibbs and the team into the life of a 12-year-old prodigy who may be the killer’s next target. Jack visits Leroy for a special reason. Meanwhile a couple find the body of a Marine first lieutenant, barefoot and thinly clothed, on a prayer rug in freezing weather in a park; Gibbs and company find the pieces and elicit a confession. Two park rangers find the burned body of a Navy test pilot on leave in a forest in the Appalachian Mountains; Gibbs and company investigate; McGee sees evidence that the pilot tried to fly a jetpack. The gang figure out what truly happened. A Saudi Arabian limo driver dies in an explosion of a car aboard NAS Patuxent River; Gibbs and company investigate; the apparent target is a Saudi prince present there for advanced training.