Captain's log - Stardate 2261.662

I can tell that Spock was barely resisting the urge to call this entire hunt illogical when I called Bones to the conference room and asked him about the mystery crewman. It was obviously still bothering Bones - he reeled off the corridor number and timeframe without having to think twice.

I had Sulu replay the security recordings for that corridor and saw Spock's eyes narrow when we froze the image on the crewman. Spock ordered the computer to run a facial recognition against known crewmembers. No match. We have a serious security breech.