NCIS: Season 4, Episode 1

4 - 1: Shalom

After witnessing a Mossad agent perform an assassination, which was not authorized by Mossad, Ziva is suspected by the FBI to be a double agent. Now a fugitive and on the run, Ziva is forced to ask for help from Gibbs, who is in Mexico after retiring from NCIS. Tony finds his leadership skills being tested to the limit as he leads the team to search for Ziva and to prove her innocence before the FBI can arrest her.