The team travel to Providence where a serial killer is on the loose and has murdered three people in public places using a knife as a weapon. He then leaves the knife at the scene of the crime. With each kill, he becomes more daring. It is clear that the killings themselves are random but perhaps the location of each of the murders has more significance?
The BAU profile portrays him as being more like an arsonist who likes to watch his buildings burn but perhaps there is far more to it than that.
I found myself not really caring because I was bored. The guest actors didn't do a lot for me either and the team themselves seemes somewhat unenthusiastic. Ah well, at least Reid is more mobile now so that's a plus! And at least they did SOME profiling with this one which has been sadly lacking in many episodes of late.