In the middle of the Cold War, a Soviet submarine runs aground outside Karlskrona and suddenly Sweden finds itself at the center of events. Prime Minister Thorbjörn Fälldin tries to resolve the conflict and avoid a world war between two nuclear powers while struggling with a wise foreign minister and a belligerent commander-in-chief.
During a police intervention, a macabre discovery is made in the trunk of a car. Josef and Oskar find themselves in the line of fire of a seemingly cold-blooded killer. But things are not what they seem.