Hanna is blown away when she finds out the identity of the infiltrator; Operation Krajina is about to be put into motion.

The police net is starting to close in on Christian, who is in danger after Stefan finds out about his affair with Blanka; Hanna and Christian are invited to an unexpected family dinner at the Mimica house.

Christian is on the verge of a breakdown after Stefan's murder, which he was responsible for; when Björn and Hanna realize Christian's deadly mistake, they decide to take him in.

Mimica plan to smuggle large amounts of heroin into Sweden by mini-submarine; Christian is assigned to place a tracker on Majmun's motorbike when he goes to collect the drugs.

Blanka warns Christian that his life is in danger after finding a film of Sven being tortured; Hanna is involved in the collection of the heroin.

Hanna desperately looks for the officer who is leaking information in the department and needs Bjorn's help.

Hanna is torn when Christian returns and must decide on whether she should let him infiltrate the police to locate the leak.

Dubravka Mimica realizes that her daughter Blanka has returned and goes searching for her; Hanna is the one hiding Blanka, who is expecting Christian's baby.

Hanna and Björn realize who the mole is, but he has disappeared; Hanna wants Christian to stop his undercover duties but Christian refuses.

Magnus is murdered; Christian's mission begins to eat away at him; Blanka discovers that Christian has returned.

The Mimica family poses as a major threat; Christian tries to discern if Davor is back; Hanna and Björn must deal with the Mimica family and a new criminal organization.