Theo and Willem suspect a mole among their colleagues, the public prosecutor Josiah Blok.
After a major drug bust, Theo and Willem are promoted to the Major Crime division. Theo insists to cover for turncoat Maartje, who is shot at o the way to his home, admits having leaked to the drug gang for years but maintains there's a high-level leak unknown even to her. That is prove when hours after a top-secret meeting, the plans for a decoy transport while the drugs are transported to Belgium for incineration are leaked and the inconspicuous truck is robbed.
Willem tries to prove that he has acted well during the shooting incident and takes charge of the investigation and can hardly restrain Theo.