The sixth season of NCIS series contains the answer to the question why the new director, Leon Vance, really split up Gibbs' team. The story resumes four months after the bombshell that sent Ziva back to Israel, McGee into the cyber unit and DiNozzo on a new assignment as an Agent Afloat aboard a United States aircraft carrier. Meanwhile, Gibbs doesn't seems to be getting on well with his new boss.