I think this case proved that there always do not have to be very big mystery behind every accident they investigate. They knew it was murder but noone expected that kind of answer, specially as it was in front of their eyes the whole time.
So.. the story starts with quite interesting camera view - a good thing to try. And I loved how they soon found themselves in big secret thing and they were first pushed of but soon realized - if there is something jeopardising their big secret mission, they need the help. And the way the finally got the answer.. by that stunt with Kate.. that was great way to figure it out.