Lars's daughter told Nikolai that her father came home late the night before. Dreyer says that Hagen said he was later meeting Lars Andreassen (Nikolai's younger brother). They learn that Hagen left the bar the previous night with Ove Dreyer. His death is initially thought to be suicide, but there is evidence that leads to an investigation by Oslo detective Nikolai and NCIS agent Anniken.
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Nikolai plants evidence in order to protect his younger brother, Lars, who appears to be implicated, but later discovers the truth behind Hagen's death. He is drawn into the investigation of the suicide of a local man named Tommy Hagen his co-investigator, Anniken Høygaard-Larsen, from the National Criminal Investigation Service, suspects foul play. Nikolai Andreassen, a police detective from Oslo, is visiting his home town, near Tista river and Swedish border.