Soon to retire Detective, Peter Devriendt, is assigned a new partner, Vicky Degraeve, who has been transferred from the intervention team due to a back injury. Their first case is the brutal murder of Esmé, a young Turkish girl. Evidence points towards an honor killing by the hands of Esmé's uncle, Ferhad Perez.

Ferhad, the presumed culprit of Esmé's murder, is viciously attacked and left for dead alongside a puzzling message which is the first of the Ten Commandments. Investigations lead Vicky to Esmé's boyfriend, Joren who is shocked to discover Esmé was pregnant. Peter asks his informant, Hristo, to find out who brought Ferhad to Belgium.

It seems that there is a serial perpetrator, who goes by the name Moses, at operates large in the city. The police investigation team receives an email with photos of three potential victims. The third of the Ten Commandments is their only clue, "Remember the Sabbath day, to keep it holy".

For the second time, Moses' actions have made it into the press. A video recorded by Moses leads Marnix and Simon, colleagues of Peter and Vicky, to a retirement home where they see a suspicious figure. Peter and Vicky make an unpleasant discovery.

Internal Affairs tackles Marnix and Simon over the shooting. Peter and Vicky probe further at the rest home and get much closer to Mozes. The press runs at full speed when Mozes seems to strike again.