Sarah has walked into a life-threatening situation.

Sarah won't get on board when her superiors insist that Nanna's murder has been solved.

Lund and Meyer become convinced there is a link between Nanna's murder and a case that has remained unsolved for 15 years, and frantically try to find evidence. Meanwhile, Pernille and Theis are confused by the fact the case is far from closed, and Hartmann puts everything on the line in a bid to win the election.