Wars never end. And for Harry Hole the war has just begun. During the Second World War a group of young Norwegian soldiers fights alongside the German army at the gates of Leningrad. They are the "front men". The battle joins them, but at the end of the war a strange murder and a desertion flap the group. When, many years later, the mountains around Oslo return the boxes of a marklin, a German rifle that, thanks to its extraordinary precision, is the ideal tool for a professional killer, Harry Hole senses that behind that finding there is something more big. And on the trail of that unusual weapon he goes into a swamp of betrayal and revenge from which it will be difficult to re-emerge.