The NCIS team searches Los Angeles for the lead suspect of a murdered Iraqi businessman, a former Marine who had been hired by a private security firm to protect him.

The team rushes to a crime scene after receiving an "agent needs assistance" page and learns that one of their own is in peril.

The team investigates the murder of a Marine who had top-level security clearance, and the corpse is missing a hand.

Kensi connects personally with a discharged Navy Intelligence officer suffering from post traumatic stress disorder who is the sole survivor of a deadly dispute being investigated by the NCIS team.

The NCIS team delves into the underground world of the Libyan resistance movement following the murder of a news reporter, and Hetty reveals details about Callen’s past.

After a diplomatic service van transporting an unknown package from the State Department is hijacked, the NCIS team must determine who committed the crime and what has gone missing. Meanwhile, Callen and Sam celebrate five years as partners, but face one of their biggest challenges when they go undercover for a case.

Nell joins Deeks in the field on a case involving a former Marine who is being tracked by al-Qaida after embezzling money from Iraq.