This episode of CSI was fantastic - it reminded me of early CSI the way the drama and action built up and up towards a big ending. If I have to be critical it would be I would of liked to see more Catherine and Greg, they only appeared a little bit each - however I did like Sara being central for the first half of the episode. She seemed very hands on and I think she may of been running the case but of course I'm just guessing.
This episode also saw the return and possible first glance at Dr. Jekyll - I am suspicious of the man they believed was Dr. Jekyll, he could easily be just working for Jekyll. I am still hoping the Langston is involved and can no longer be a CSI so Grissom can make a return ... but maybe that's just me wishful thinking.