Nikolai Andreassen is an Oslo police officer who is given leave after he gives evidence against a popular senior officer accused of murder. He goes to his home town and stays with his brother, also a policeman, and his children. The next day he accompanies his brother when a body is found. It looks like a suicide but he isn't so sure. Before the first episode is out he learns the identity of the killer; it is his own brother and he gives a plausible explanation as to how it was self-defence. Once Nikolai has accepted this and helped cover up certain details he can't easily get out from the lie. Fellow officer Anniken Høygaard-Larsen gets more and more suspicious that things aren't as people claim and more secrets are revealed.
I thought this was a solid series. Early on it seemed obvious which way it was going but as it progressed there are some good twists and turns as well as a sense of danger. The pace might be considered slow by some but I didn't find that to be a problem; some things don't need to be rushed. The cast is solid; most obviously Tobias Santelmann as Nikolai. The ending wraps up many questions but left things open for a second season... although after five years I can't see that happening. Overall a good series that I'd recommend to fans of Scandinavian crime dramas.
These comments are based on watching the series in Norwegian with English subtitles.