That was interesting case - I really loved the connections between the Jack the Ripper case and the murders happening now. Also that they brought in the son of detective who worked on the case before the storm.. and the little twist they had to use - it was female behind that all.
If you thought the case story was not moving or well written enough, then there was the case of Reid who finally admits he is in trouble. And the friend he has who said that if he thinks his colleagues won't notice that he has changed.. then he is far from genius..
Who knows what happen next.. And I most say I loved the chemistry between JJ and that detective.. something positive in all those bad things.