Norway, 2001. The bodies of two boys of the same age were found in a field near the outskirts of Oslo. The killer carefully placed the fox between them. The crime was reminiscent of the murder of two boys in Sweden in 1993. Only then there was a hare lying between the bodies. In the diary of one of the children there was a strange entry: “Tomorrow there will be a full moon. I'm afraid of the Wolf." The case remains unsolved. Holger Munk, head of the new investigative unit, assembles a team of the best Norwegian detectives. Among the new recruits is Mia Kruger, a promising police academy student. In photographs from the murder scene, she instantly discovers details that experienced investigators did not even pay attention to. Mia has no idea that participation in this case will lead her into a world of darkness. Meanwhile, two more boys disappear...