In the hopes of sparing a family further tragedy, the Secretary of the Navy calls on NCIS to help a sailor battling leukemia locate a bone marrow transplant after his two Marine siblings are killed in the line of duty. ...
A Navy petty officer dies of gunfire in a park in Washington, DC; Gibbs and company investigate; Hollis helps. The gang find an accessory for hire to a terrorist. An explosion kills six and injures 22, including Delilah. [Continued.]
While McGee stays with Delilah in a hospital, Gibbs, Tony, and Ellie find and recover a bullet, which bears the DNA of the wheelman, whom Gibbs clipped during the escape; Abby identifies him, and she and Tony gather data about him, which Gibbs and Duck review. Gibbs, Tony, and Ellie see the escape SUV, which bears a message; Abby finds a modification to it. McGee gets approval to return to work, but Dr. Cranston learns that McGee has avoided an unpleasant new truth, so she talks with him. CIA and NSA help with the search for the terrorist; McGee finds an address for ...
Ellie's gut says that Parsa is in his home district in NW Pakistan; there a SEAL team captures him alive. Gibbs, McGee, and Ellie fly to an aircraft carrier, where Gibbs and Ellie question him. Ellie gets into a bind, but Gibbs saves her.
An overturned van in Washington, DC, contains body armor, which Abby shows to be faulty and fatal; Gibbs and company find the body of the driver, then the source of the bad gear and the path to the troops in the Middle East. Justice wins.
When Tony seeks to question a man who appears to impersonate a Naval officer, the man draws a pistol; Tony kills him. The dead man proves to be a private investigator who had become involved in international intrigue. The gang sort it out.
Backstage before a charity-benefit concert in Washington, DC, an explosion kills a Navy petty officer first-class; Gibbs and company investigate; Abby fingers the bad guy, McGee finds out about him, and Gibbs and Ellie catch him at work.
In New Orleans, Louisiana, two local special agents of the NCIS, Pride and LaSalle, start to investigate the death of Dan McLane, who was not only a member of the US House of Representatives but also both a retired Naval Reserve commander and a retired agent of the NIS (before the NCIS); Dan had worked with Franks and had served as a mentor to both Pride and Gibbs; King Pride, a former partner of Gibbs, goes to Washington, DC, and spends time with Gibbs. Inter-agency intrigue begins; the FBI seizes control; a joint FBI-NCIS effort proceeds; Fornell joins the hunting ...
While investigating the death of a US congressman, the Gibbs team and the gang in Nola continue to seek both a killer and a connection to an old case. Another man dies. Ducky suggests a theory, and the bunch put all the pieces together.
Delilah finds a clue, which may help to solve the alleged death of a US Navy lieutenant, Kit, two weeks ago in Budapest, Hungary; then her boss orders her that she has never seen it; however, she surreptitiously speaks with Tony, McGee, and Gibbs, who sends Tony and McGee to check for chinchillas and to find evidence. Then Tony and McGee meet a man who claims to be an agent of the CIA, who tells a wild story to Vance and Gibbs, and who asks them to back off; still, though, Vance tells Gibbs and Ellie to continue pushing quietly. Abby and Jimmy, interpreting the ...
A distracted texting driver runs over the dead body of a Naval officer; Gibbs and company investigate; they find a connection to a previously unreported rape of a drugged victim. The team figure out everything, and they catch the bad guy.
During a court-martial of an Army first lieutenant, a Marine photojournalist disappears before he can testify; while Gibbs and company lend a hand, they find the body of the Marine, solve his murder and another one, and arrest two bad guys.
Tony goes to France to escort an admiral's daughter, Amanda, back to DC; meanwhile Gibbs and company investigate a death. Tony and Amanda run into trouble, work it out, find solutions for all seven executions, and report to the admiral.
Gibbs and McGee are shot down in a Naval helicopter over remote parts of Russia while on a mission to escort an NCIS computer geek safely home. Meanwhile, the gang at home anxiously work to help bring them all home safely.
A Navy Commander is murdered near the White House, it is learned that he was on his way to talk to the President. Gibbs and his team must determine if it is because of his relationship with the President or because of his marital problems.
Flashbacks into his past help tell the tale for Dr. Mallard as he and Bishop travel to England in search of answers to find out why an Englishman murdered in the United States would have a list of deceased Navy men on his person.
After a scientist is decapitated by a strangulation device in a park, Gibbs and his team search for the woman who was her former research partner in Russia in order to learn who is behind her murder. They learn it may be a familiar foe.
While the NCIS team is on a training exercise with CGIS Special Agent Abigail Borin, Gibbs spots a man overboard. It leads him to board another ship called The San Dominick, and he soon discovers that it has been taken over by pirates.
The wife of a Navy Seal is murdered, and the NCIS team discovers she has a background in criminal forensics and recently visited a serial killer in prison seeking his help with another sociopath. Gibbs and company must figure out who it is.
While investigating the death of a retired Marine Master Sergeant, Gibbs and the NCIS team discover there is a possibility that his death may be connected to another Marine who was MIA from the Vietnam War.
A former Navy hospital corpsman gives aid to the victims of a wreck; local officials arrest her for practicing medicine without a license; Gibbs and company find the other driver, his killer, and a lawyer who makes a deal for the corpsman.
On the eve of Thanksgiving, DiNozzo and Bishop experience a weather delay at the D.C airport when Gibbs informs them of an elevated terror threat specific to area airports. An impostor posing as an air marshal leads them to the real threat.
Tis the season to be hacking. In a Christmas letter to his father, McGee describes in detail a case in which he, Gibbs and the rest of the NCIS team investigate the hackers who are responsible for the Internet going down in the D.C. area.