De Cock and his team investigate the murder on a red-haired woman, and discover that there is a serial killer at work. Buitendam decides to call in an expert from outside the team, which only makes tensions rise even higher.
The throat-slash killing of a red-head, left near a postal box, fits the pattern in two other cases, with different lead suspects, no proof. After weeks without a solid lead to the presumed serial killer, Amsterdam PD head office imposes FBI-trained profiler Hans Kaptein. He adds two old cases to the list and correctly estimates time and place of the next. De Cock, puzzled by 'medium' Constant Pool, is relieved from the case but keeps looking into anonymous notes from self-proclaimed culprit Artemis and that mythological pseudonym's possible implications. Written by