Sarah and Jan find suspicious evidence in the high school basement and zero in on Nanna's ex-boyfriend Oliver and his friend Jeppe. Troels and Rie try to eliminate the leak.

Troels lands in more trouble as someone who is part of his campaign becomes a suspect. As Pernille and Theis say goodbye to their daughter, Theis inserts himself in the case.

Detective Sarah Lund is about to move to Sweden with her boyfriend and son, but her plans are derailed by a disturbing case with potential connections to a prominent politician.

Sarah and Jan pursue a vital new lead but someone unexpected intervenes. Drastic personal changes affect Sarah. Meanwhile, Troels attempts to establish a new alliance.

New information puts the prime minister under scrutiny by the police. Matthias goes too far and is removed from the case. A new witness claims to know something about Emilie's kidnapping.

When Sarah and Jan go to a warehouse to look for evidence, things take a dire turn. Troels struggles to revive his political career. Theis and Pernille find surprising evidence in their new house.

Sarah and Jan interrogate Troels, who divulges private information that leads to a potential breakthrough in the case. New evidence further puts the spotlight on him.

Theis and Pernille's worst nightmare comes true when it's confirmed that they're 19-year-old daughter Nanna has been found. The car she is found in is linked to the office of mayoral candidate Troels.

Ex-soldier Jens Peter Raben makes a bold move. When resident Islamists are arrested, Sarah and Ulrik disagree on which leads to follow. Buch is plagued with problems in Parliament.

Sarah and Ulrik have gone to Afghanistan to track down the killer, with shocking results. Back home, Brix decides to conduct a search at the army barracks and Buch is convinced of a cover-up.