Mia tells DCI Cadi that she is pathetic and useless, just like her father. It was thanks to Cadi's work in the first series that her father's most famous conviction was overturned. Thanks to Cadi her father's career was remembered for the disgrace of a wrongful conviction. Then between series one and two, her father died.
The main villain in this second series is Mia, played by Annes Elwy. She is supposed to be 15 years old, but she looks 35. In fact Annes Elwy is 30 years old. Through the entire series she does a great job as a cold-blooded killer and manipulator of the people around her. She bullied a friend into committing suicide, killed two people, and laughed all the way to prison. As she tells Cadi, "What do you want me to do? Say I am sorry?"
The story is great, but the series could have been alot shorter. Endless family discussions for every character really drag this out. Every time someone goes for a walk, a smoke, or a drive, there is a solid minute or more filmed of the character walking, smoking a cigarette, driving down the road, etc. I have seen the same roads hundreds of times since the first series. It is profoundly boring, and not a creative way to pad the time on every episode.