Internal Affairs

The discovery of the dead body of La Grenouille causes the Washington office of NCIS is investigated by the FBI, with Jenny as the prime suspect for his murder, the NCIS building being shut down by the Bureau and Assistant Director Vance relieving the Director and taking her place for the time. The team assembles discreetly at Gibbs' house and investigate for themselves and confirm that he was indeed murdered. After evidence comes to light exonerating Jenny, Jeanne reappears and blames Tony for the murder, at first, but Trent Kort (who has since, with the blessing of the CIA, taken over La Grenouille's business) arrives and claims responsibility. At the conclusion of the episode, Gibbs tells Jenny that the story she told wasn't accurate, and it is inferred that Jenny killed La Grenouille, due to Gibbs having seen the arms dealer putting the gun on the director's home desk although Gibbs does not take any action, simply stating, "Long live the queen."