Inspector Zoë Janssen has finally solved enough prominent cases to earn her the opportunity she's always dreamed of: to work alongside a team of profilers, training to become one of them. She's brought onto a case in Rotterdam to track down a perpetrator who's drugging and mutilating prostitutes, using her skills as a profiler and a detective to bring her closer and closer to solving the case—until her determination leads to a risky decision that puts her own sister's life in danger. Meanwhile, escaped serial killer Sven van der Linde continues to send her mysterious codes that seem to be building towards an inevitable confrontation between them. The pressure to solve the case of the mutilated women while simultaneously trying to crack Sven's codes pushes Zoe to her limits, with the stress rippling out to affecting her relationships with her family and partner.