While his mother is back in rehab in Oslo, Philip (Axel Bøyum) is living with a foster family in the village of Mysen. The withdrawn young man's only friend is motocross hopeful Henning (Odin Waage), and Philip puts his feelings on the line one cold night in a shack at the quarry run by Henning's father. Their first time is interrupted by the arrival of black Audi carrying four bikers planning to carry out a hit and dump the body. When their intended victim (Per Kjerstad, TURN ME ON, DAMMIT!) gets the upper hand and executes all four, he also notices the boys watching from the shack. While the killer goes after Philip, Henning is able to knock him out and the two boys flee. Philip wants to go to the police, but Henning is more concerned about being labeled gay than a witness to four murders, or possibly five since he fired the killer's gun and believes he killed the man. Philip agrees not to say anything since Henning saved his life and they throw the gun into the pool beneath a waterfall. When the bodies are discovered the next day by Henning's father Runar (Fridtjov Såheim), fear spreads through the village of killers in their midst and Philip's foster mother Helen (Anneke von der Lippe), the Sheriff of Mysen, finds her investigation impeded by Special Operations officers Lars (Tobias Santelmann) and Camilla (Yngvild Støen Grotmol) who recognize among the victims informer Christer (Åsmund Brede Eike) who had tipped them off the night before of the planned hit but not the identity of the victim. While Camilla has to deliver the bad news to her sister Siri (Mariann Hole) who has a child with Christer, Lars – resentful that the SO has been made auxiliary to former NCIS (National Criminal Investigation Service) officer Helen's investigation – and the Special Operations unit investigate the biker gang to which the victims belonged and their ties to another gang known for dealing in hashish and amphetamines. After Camilla confides in the details of Christer's tip, Helen's unit looks into missing persons for a likely victim.

Both units converge on the restaurant of Balkan mobster Hamit (Mahmut Suvakci), Helen by way of a missing persons report on the man's daughter Zana (Tehilla Blad), and Lars when a bombing of the location seems like retaliation from the bikers. Hamit and the biker gang's leaders are just as in the dark about the murders, and subsequent acts of violence further muddy the waters. When a ruthless reporter publishes a story of Christer being an informant, Camila becomes concerned for Siri's safety, but Siri is offered protection by one of Christer's biker friends (Kim Sørensen) in exchange for the whereabouts of a package the dead man was holding for him. By staying silent, Philip starts to feel partially responsible for the acts of violence the press are tying to the Mysen murders, but he remains loyal to Henning. At school, Philip finds that Henning is trying to put distance between the two of them, while at home Helen believes Philip's evasive behavior has to do with the lack of trust between them over his mother while husband Svend (Bjørn Skagestad) believes they are the ones who have not done the work to gain Philip's trust. When Henning reveals to Philip that he has been suffering from insomnia and asks him to score some tranquilizers, Philip initially agrees until his mother leaves rehab and he has to fight to convince her to go back and for the clinic not to give up her spot, and he may have to betray Henning to help him. Unbeknownst to all concerned, the killer has been able to place himself in a position to follow the investigations and have information about the witnesses handed right to him.