Holger Munch and Mia Kruger

When a six-year-old girl is found dead, hanging from a tree, the only clue the Oslo Police have to work with is an airline tag around her neck. It reads, 'I'm travelling alone'. Holger Munch, veteran police investigator, is immediately charged with reassembling his homicide unit. But to complete the team, he must convince his erstwhile partner, Mia Krüger - a brilliant but troubled investigator - to return from the solitary island where she has retreated with plans to take her own life.

Winter 1999. An old man is driving home when his headlights catch an animal on the empty road up ahead. He stamps hard on the brakes. But it is not an animal at all. It is a young boy, frightened and alone, with a set of deer antlers strapped firmly to his head. Fourteen years later, a body is found in a mountain lake. Within weeks, three people have died. Each time, the killer has left a clue, inviting Special Investigations Detectives Munch and Krüger to play a deadly game - a game they cannot possibly win. Against the most dangerous and terrifying kind of serial killer.

In Sweden two young boys are murdered, their corpses left in an almost brutally artistic arrangement, and the case remains unsolved. Years later, two more young boys are murdered in Norway in similar circumstances. Mia Krüger, a young trainee at the Police Academy is drafted in to help solve the case due to her uncanny ability to piece together these horrific stories. Teamed up with Munch, her skills and his experience start to show that the two cases may be connected.