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In Los Angeles, Gibbs and McGee continue working with the NCIS division in order to track a terrorist cell. Agent Callen goes undercover, while a psychologist uncovers the truth about the relationship between Gibbs and Agent Macy. Meanwhile, Tony fears that Ziva may not be loyal to NCIS.
The team heads to LA to work with the team there to investigate a murder, which soon turns into something bigger. Meanwhile, Tony begins snooping into Ziva's private life.