I watched the first version which was good but full of red herrings and just about every character when being introduced was shown in a suspicious light so as to fool the viewer into thinking "this must be the one".
This American version stuck to the story for awhile, even to the point of the chunky sweater, sweet chewing, permanently worried look on the face of the female detective.
They have certainly deviated now so it looks as though we may not even have seen the murderer as yet. The character I most dislike and think has been miscast is that of Jamie, the so called Intern. He looks as though he was plucked out of a Harry Potter or Lord of the Rings film.