Denmark, 2014. A former police officer asks Carl Mørck, head of Department Q, to find out who brutally killed his young twins in 1994. Although a local inhabitant confessed and was convicted of murder, Carl and his partner Assad soon realize that there is something in the case resolution that is terribly wrong. The murder of young twins initially implicates a group of upper class students as the killers, though the case takes a turn or two from its starting point.