Anita's five-year-old daughter Julie goes missing whilst playing in the playground on the council estate where they live. A huge police search is put into action, an incident room created, neighbours interviewed and arc lamps set up. Twenty-four hours later, hope is fading of finding Julie alive.
Criminal investigating officer Hanne Wilhelmsen considers the possibility of a serial killer as she tracks down a series of numbers written in blood appearing on walls all over Oslo.