<P> He also used the old team to further his investigation: McGee was sent to Cyber to break into Vargo's computers while Ziva was sent back because Vargo was a Middle - East specialist - her target was Vargos best - friend . Tony, currently on the carrier USS Seakawk is then asked by McGee and Gibbs to hack information to find what the mole was after, and discover Operation Domino: the US' plan in the event of an attack on the Middle East . McGee begins investigating Gibbs' team when they find that their victim had been calling Agent Lee, only for her to dispute it and say he was asking for legal advice; Gibbs and Vance learn of Palmer's relationship with Lee, solidifying her alibi . </P> <P> Langer and Keating become anxious when they realize that their bank records are being viewed, and Lee informs them that they are being investigated . As Vance and Gibbs begin to interrogate Keating, Langer and Lee decide to "check out" the computer archive center, despite it being prohibited . Moments later, Gibbs gets a frantic call from Lee, claiming that Langer is the mole . Gunshots are heard through the phone, and they rush to help her, finding a frightened Lee and dead Langer . </P> <P> To Abby's delight, Vance begins to reverse the disbanding of the original team: McGee is reassigned to Gibbs' team, and Eli David agrees to allow Ziva to return to agency . In a private conversation, Eli tells Vance, "Use her well, Leon . Ziva is the sharp end of the spear ." Agent Lee leaves to return to her old position; however, in private, Lee receives a text asking "Do they suspect?" and it is revealed through a brief sequence of flashbacks that she was the mole . </P> <P> The episode was written by Shane Brennan, who was executive producer at the time, and directed by Tony Wharmby . The premiere date was announced on June 26, 2008 . </P>

Why did director vance break up the team