Ep 1. Shalom

In the season 4 premiere of NCIS, titled "Shalom," the team faces a shocking development when it is revealed that Ziva David (played by Cote de Pablo), the team's Mossad liaison, has gone missing while on an undercover mission in Israel. The episode picks up with the NCIS team frantically searching for their missing colleague and friend, unsure of her current whereabouts or the danger she may be facing.

As the team begins to investigate Ziva's disappearance, they discover that she may have been using her undercover identity to infiltrate a group of extremists who are plotting a series of terrorist attacks against the United States. Fearing the worst, the team races against the clock to track down Ziva and stop the impending threat before it's too late.

Meanwhile, the team must also contend with the loss of one of their own, Caitlin Todd (played by Sasha Alexander), who was killed in the previous season's finale. The episode features several emotional moments as the team grapples with their grief, both for Caitlin's death and the potential loss of Ziva as well.

As the plot thickens and the team inches closer to discovering Ziva's whereabouts, they begin to uncover a web of deceit and manipulation that has ensnared not just their missing colleague, but several other key players as well. With danger lurking around every corner, the team must rely on their sharp investigative skills and quick wit to stay one step ahead of the terrorists and prevent a catastrophic attack on the nation.

Throughout "Shalom," viewers are treated to a captivating blend of action, suspense, and emotion as the NCIS team works to solve the case and bring their missing teammate home safely. With a compelling storyline, strong performances from the entire cast, and plenty of heart-pounding twists and turns, this episode is a must-see for fans of the long-running series.