Mildly interesting, but none of the cases seemed especially compelling. Perhaps it's just me: arson and domestic terrorism don't tend to be the sort of mysteries that get me really excited, and this also tends a little too thriller for my CSI tastes, what with explosions and gun battles and all. I like this series for the science, and while there's a lot of that here it's all in service of cases I don't care too much about. Perhaps the most interesting one was Nick and Sara and the forest fire, but that's because I like the outdoors and environmental crime does strike me as compelling; this particular plot was supporting only, though.

What did strike me was that Catherine was, at one point, referred to as a former medical student. Maybe I'm remembering wrong, but that doesn't seem right. Medical and laboratory science I could buy, because she was always good with blood spatter, but otherwise that might have been an editing fail.