Bernt Lund harbours a sickness - He is a monster: in the mind of society, in the mind of his nine-year-old victims' parents and in the mind of his fellow inmates. Lennart Oscarsson has a situation; the worst scenario imaginable for the head of Aspsås prison's Department for Sexual Crimes. These two men's actions are about to hand DCI Ewert Grens the most profoundly sickening and impossibly sensitive case of his career, and in Stockholm's history.