When an old university friend plummets to his death through a skylight window it's just the start of Angel's troubles, as he gets his arm twisted by the police to help them with their enquiries into a group of animal rights activists, who might just have something rather more deadly on their minds than a bit of foxhunt sabotage.
Criminal investigating officer Hanne Wilhelmsen considers the possibility of a serial killer as she tracks down a series of numbers written in blood appearing on walls all over Oslo.