A scientist is killed in gruesome manner. The team investigates, they're summoned by the SecNav to meet them at the Pentagon. They meet with a Russian official who tells them that Mishnev, the man who tried to kill Gibbs is involved. He tells them that one of their scientists who is a friend of the one who was killed is suspected of murder and is now in the US. He wants them to find her. Gibbs wonders if the man has an agenda but the SecNav tells to do what he asks. They find themselves working with an FBI agent who seems to be some secrets too.