Last Man Standing

Gibbs is given the task of finding a mole inside his newly formed team. With the help of Agent McGee, Gibbs is able to trace phone calls between Lee and a dead Petty Officer the team had discovered earlier. After verifying Agent Lee's logs of the calls she is cleared. Daniel Keating is focused on next and he is interrogated. During Keating's interrogation, shots are fired, and Lee is found to have shot Agent Langer, who Gibbs and Vance agree to have been the mole. At the end of the episode, McGee and Ziva rejoin Gibbs in the squad room. Agent Lee is in the elevator, leaving, when she receives a text message saying, "Do they suspect?", to which she replies "NO", revealing to the audience that she is in fact the real NCIS mole.