Ten days after lawyer Anne Dragsholm was found dead at a WWII memorial, the police have her husband in custody for her murder. But the chief of investigation calls on Sarah Lund, who has transferred away from the crime squad, to return to Copenhagen to look over the case.

Sarah Lund officially joins the investigation into the murders of Anne Dragsholm and soldier Allan Myg Poulsen, who was found butchered in a warehouse.

While intelligence services insist that the investigation should focus on possible terrorism links, Raben's escape strengthens Lund's interest in his links with the victims.

The murder of another former soldier, David Grüner, prompts inquiries into his and Raben's army squad and a particular event during the group's Afghanistan mission a few years before.

The police investigation comes under fire after soldier Lisbeth Thomsen was killed by a bomb planted in her boat, but Brix keeps Lund and Strange on the case.

Lund demands that the grave of the dead soldier Per K. Møller be dug up, but her theory that the coffin is empty is proven wrong.

After finding the chaplain assaulted in his church Sarah Lund chases the offender, but ends up battered in an alley.

ens Peter Raben has been shot by Strange during an escalated situation where Raben seemed to recognize Strange. Raben survives, and Lund finally has the chance to interrogate him.

Thomas Buch has refused to resign and calls a party meeting to challenge the authority of the prime minister. He finds an unexpected ally in the minister of defense.

Lund and Strange return from Afghanistan with their findings, though Brix has become convinced of the guilt of officer Bilal, who has run away with Louise Raben as his hostage.