With some expert help from the forensic team, and a tip off, The Police make an arrest, and present some compelling evidence.
This is the way it should be with a TV series, it builds and builds, and ends with a big, dramatic climax, that is the case here. This final episode is excellent, it truly is impressive.
It has been a little up and down in places, but in the fifth episode they took it up a notch, but this was the series high point.
Every loose end, and seemingly unexplainable thread is explained.
It could perhaps have been done over four episodes, but this one, excellent, 9/10.