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Callen and the rest of the NCIS team refuse to accept Hetty's sudden resignation without an explanation. They start their own investigation to find out why she's disappeared, hoping they can track her down.
New information comes to light about a stolen radiation therapy canister when a person pretending to be a Navy SEAL is set on fire. The missing Brachytherapy canister contains radioactive seeds that can be used to make bombs.
When Deeks' best friend and major informant needs protection from death threats, Deeks must go undercover as one of his old aliases.
Eric's going undercover for the first time to make sure that classified technology remains secure after a rocket engine expert ends up dead in a test chamber.
When a Marine base's secure facility is breached, the team must determine what it was that was targeted for theft. In order to accomplish their mission, Kensi must go undercover.
NCIS must determine if a Venezuelan politician is in imminent danger of being assassinated. It all hinges on a Navy Intelligence Commander who has gone missing.