Martin's grandson Vilhelm Beck is out on a routine mission with his supervisor when he finds a dead 17-year-old boy at the crime scene. It immediately becomes a case for Alex, Martin and the others in the Beck group.After a raucous youth party in a residential area outside Stockholm, one of the party-goers is found dead.

Josef is suspended, pending an internal investigation of his alleged assault of Säpo agent Klas Fredén, who has climbed to even higher heights within the police organization.

The Beck group are called out to investigate a man who was brutally murdered in his own home.