A sixteen-year-old boy, Rodger, disappears in Westeros, Sweden. Soon, his mutilated body with his heart cut out is found in a swamp near the city. Meanwhile, Sebastian Bergman, a former criminal psychologist and specialist in serial killers, comes to Westeros to settle matters with his mother's inheritance. After the death of his wife and daughter, Sebastian resigned from the police and cut himself off from the outside world. He shows no interest in killing Rodger until he is confronted with a secret from his own past. Bergman needs to gain access to police reports, so he joins the investigation. Soon, the Palmlev Gymnasium, which Rodger attended, is caught in a web of lies and deceit, completely captures Bergman's attention... But will he be able to bring the investigation to the end, keeping his dark secrets?