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Gibbs teams up with an old foe, CIA agent Trent Kort, to hunt down an international criminal at the top of NCIS's most wanted list. However, evidence emerges that Kort has an underhand agenda of his own.

Abby has to take over a top secret government mission when a scientist goes missing. While the rest of the team worries about her safety, Abby realises things may not be as they seem.

The team heads to LA to work with another NCIS team on a murder investigation, which soon turns into something bigger. Meanwhile, Tony begins snooping into Ziva's private life.

Cat feels torn between Gabe and Vincent; as Vincent and Cat try to save Sam's latest victim, they wind up in a compromising position.

In order to prevent Sam from destroying a large group of people, Cat and Vincent are forced to revisit a romantic destination from their past, which enables them to come to a new realization about what they mean to one another.

A girl is shot and Cosgrove teams with Det. Jalen Shaw to track down her killer; Benson and Stabler assist and realise it's more than a typical homicide; McCoy and Price seek justice against an international crime ring; part 2 of 3.