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There is no Next Episode of Modus planned.
Inger Johanne Vik have previously worked for the FBI, but is back in Sweden now with her two daughters. She have decided to spend more time with the kids and less at work, but all this is about to change when her eldest daughter Stina, who is diagnosed with autism, witnesses a murder.
Inger Johanne becomes more aware that Stina have seen something terrible. Ingvar goes to Uppsala to investigate the murder of bishop Elisabeth Lindgren. It is obvious that secrets are brewing.
Inger Johanne accepts the offer about being part of the investigation. Meanwhile she is trying to piece together information her daughters have. The question is if there is any connection between the murders. Rolf suspects that his husband is cheating on him.
Lennart Carlsson is taken in for questioning and Inger Johanne discovers a connection between Carlsson and herself. The question is what her family has to do with the investigation. Erik visit the woman in the picture at the bishops workroom.
Robin Larsson is found dead from his beatings. With the help of the FBI, Inger Johanne uncovers the group responsible for ordering the murders. Rolf Lunberg realizes he and his husband Marcus Stahl are connected to all 4 murders and reports it to the police. A 5th murder victim is left outside the offices of Marcus' and a witness sees the murderer placing him there.
The noose is tightened around Marcus Ståhl which ended up in a vulnerable situation. The bishop's husband can't keep the family secret any longer. During a review of the perpetrators modus, Inger Johanne discovers a frightening connection between the murderers profile and her own daughter.
Inger Johanne gets closer to the murderer and the is convinced that they key to how it's all connected is under the black color. Marcus Ståhl gets to a point where he can't lie anymore and when the truth gets out it will have dire consequences for many.
In the season finale, Inger Johanne and Ingvar have a clear picture of who is the murderer and the motive, but disagrees on the next step. There is one final victim, and the question is who that is. Stina makes a decision that places her and her sister in a dangerous situation.