A very good ending for a great season!
Plot: amazingly done and displayed. It takes the right time to let you see what you need to and it lets you have some slow moments to let you assimilate what happens. And everything is consistent.
The only thing that I did not get is the solicitors' use. They were always there during interviews just to... To be there. They never said a word.
Actors & Acting: well there are some high and low levels of acting skills, here. The two main characters (and not only) are very good at it while others not so much. But at least there is nothing really bad.
Soundtrack: liked it. It accomplished well all the season with all its events.
Conclusion: a very great season, highly recommended to everyone who like crime, thriller stuff. With also some dramatic and moving scenes. Sometimes you'll have to close your eyes in front of some acting but the story worth it a lot!