Detective Huldar is out of his depth. His first murder case is like nothing hes seen before - a bizarre attack on a seemingly blameless woman. The only evidence is a list of numbers found at the scene, and the testimony of the victims eleven-year-old daughter, who isnt talking. While his team attempt to crack the code, Huldar turns to child psychologist Freyja for her expertise with traumatised young people. Because time is running out... and the one thing they know for certain is that the murderer will strike again.