Police profiler, Arnar, is out of his depth when he is ordered against his will to travel from Copenhagen to Reykjavik, Iceland to help investigate Iceland’s first serial killer case. Arriving in Iceland, Arnar is quickly paired up with senior inspector Kata, who isn’t happy with his involvement as she is the lead detective on the case and now feels demoted by his arrival. Despite the underlying conflict between them, they have to find a way to set their differences aside and work together in order to catch the killer before he strikes again.