NCIS - Dead Reflection

Even though it only just touches on the Port to Port killer storyline from the last episode, this was yet another brilliant episode of NCIS.  A woman is found dead with a broken neck in the Pentagon!  Video surveillance shows the murder and the killer quite clearly but he can't be found.  It is only later that his body shows up in his car, run off the road that the real mystery begins as Ducky announces that the victim died two days before he was in the video at the Pentagon killing the girl!?
There are some clever parts to this story, with a reference to Mission: Impossible.  DiNozzo is off his game due to his relationship with Barrrett, so he goes to see Gibbs who tells him to stop sleeping with her and that it is affecting his work.
I am not going to tell you who the killer was or how he did it, it is just too clever and you really do need to see it for yourself.  Especially how Abby works out what is being said by looking at the mirror in the video!
The episode ends with Barrett and Palmer, putting the eyeball from last week's episode up against the retinal scanner and it opens the door to MTAC!  Who's eye is this?  What does this mean?  Only three episodes to go in this gripping season!