A police officer conducting an undercover investigation of a motorcycle club disappears.
Christian gets more and more involved with the Mimica family's criminal activities. Hanna try to find her kidnapped colleague Sven and contact the mysterious "Inez"
Thanks to the information from Christian, the police now have the name of the murder with the neck burn. Alone in the kitchen, Christian and Blanka Mimica start kissing.
Björn appear to have his own agenda in investigating the link between the Mimicas and the motorcycle gang Mobsters, who now discuss a business deal.
Stefan discover Christian having sex with his fiance Blanka but decide to keep quiet about it The Mimicas have made a deal with the Mobsters' second-in-command.
Although his cover is blown, Christian continue to work for the police. The Mimicas are preparing a large drug deal.
Stefan follow Christian around to see if he meets Blanka - and discover that Christian meets with a police
After Stefan's death, Christian is very upset about his role and Blanka want them to leave together. But he travel with Davor to Kaliningrad to finish a weapons deal.
The official part of the police investigation is finished when one person confess the murder of the policeman. But Operation Krajina is going forward and Blanka is approached by the police to give information.
In the final episode, there does not seem to be any evidence that point directly at the Mimica family being involved in criminal activities.
Last season, police Hanna Svensson and her son Christian were close to joining the hunt for Davor Mimica and his criminal network that Christian infiltrated. Christian fled abroad. Hanna was given the assignment to reveal the leak within the police, a prerequisite for Christian to be able to return home. Now Hanna and her colleague Björn have learned that the police leak has been sold to a larger organization. The tracks lead them in a frightening direction, very close to themselves.
Christian is back in Sweden and Hanna must now quickly find the police leak that was sold to a circle of corrupt police officers. Hanna is facing a painful decision. Should she throw Christian straight into the fire again and let him infiltrate the circuit to find out who the police leak is? And will Christian manage to go into a whole new identity that does not risk being revealed by the circle?
Christian's girlfriend Blanka is back in Stockholm. Dubravka Mimica finds out that her daughter is back and understands that she is the one who can lead her to Christian. Does Hanna dare to trust Blanka to stay invisible? Christian is on his way to infiltrate the circuit, but must pass the interview with the leader Lena. Does his cover coat hold all the way?
Christian is in the Circle, but one mistake makes him have to push the boundaries so as not to make Lena suspicious. At the same moment as Hanna and Björn understand that Magnus is the police leak, he is abducted. Who has taken him? Laura manages to make friends with no pleasing Blanka. Hanna tells Christian that Blanka is back in Stockholm, but a contact between them is out of the question. When Christian and Lasse Wiking are to meet a drug courier, Christian understands too late that he is heading straight into his arms at Mimicas
Police leak Magnus is murdered, but neither the Circuit nor Mimica seems to be behind the murder. There is a third player. Who are they? Lena will be contacted soon. Jan has assumed that he has a child with Hanna. They decide to meet on your hand. Christian becomes increasingly boundless and soon balances on the border. But he refuses to jump off before they have all the names in the circuit. And he's close now. Mimicas starts calling in Christian. After a fateful meeting, the snare is tightened.
Mimicas has found Christian and is carrying out a coordinated attack on him, Hanna and Björn. The organization that now controls the circuit makes Lena painfully aware that she cannot refuse orders. Lena is ordered to carry out an assault on a person in a high position. Jan is shaken. He has learned that he has an adult son with Hanna. Hannah's lies in the past have started a dangerous chain reaction of emotions.
Christian, Hanna and Björn managed to escape Mimica's attack, but now the people around Hanna are starting to disappear. She has no contact with Christian, Björn or Blanka. Hanna has also understood what Christian did in Costa Rica. Is that why he stays away? Lena realizes that the circuit is lost to the organization that ordered them to carry out an attack. Now she plans to disappear. Is Christian coming along?
The leader of the circuit Lena conducts the attack on the Minister of Defense and the commander and ensures that Hanna becomes the main suspect. Christian realizes that his mother is now being hunted as a terrorist. Blanka tries to escape from Mimica's and finds that Björn is also the prisoner of the family. Lena orders Hanna to be murdered, while planning her escape with Christian to Tangier. Now everyone is fighting for their lives.