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.

A family of four is quarantined in their home as a virulent strand of the flu spreads into town and they are forced to the extreme to escape alive.