A jawbone is found in the middle of the forest. When the rest of the body is found, it turns out that it has just recently been moved and belongs to Viktor Eklund, who has been missing for five years.
Police trainee Vilhelm Beck is out on an internship with his supervisor when, during a routine burglary case, he finds a dead 17-year-old boy at the scene of the crime.
During a police intervention, a macabre discovery is made in the trunk of a car. Josef and Oskar find themselves in the line of fire of a seemingly cold-blooded killer. But things are not what they seem.
A man is found dead at a flea market in southern Stockholm. It looks like an ordinary robbery gone wrong, but the investigation takes an unexpected turn.
A man is found brutally murdered at a running track in the woods. At the same time, Josef resumes the relationship with a former girlfriend from school, Cissi, whose father recently died of a sudden heart attack during a robbery. Josef goes against Alex's directive and begins an unofficial investigation into Cissi's father's death, which puts him in a complicated conflict situation.
A body is found in the water near Liljeholmen. The body belongs to a 39-year-old Danish citizen with a solid criminal record and who was a member of a notorious Danish drug gang. Should the Beck Group get a gang war on their necks? Martin Beck is back to the joy of the entire Beck group. Martin's daughter Inger is not as happy but has to accept her father's decision to start working again.
A candidate for the Nobel Peace Prize is brutally stabbed to death in central Stockholm just after a meeting with two lawyers from the war tribunal in The Hague. One of the witnesses worked with Alex when she was in the Middle East.
In a playground in the centre of the urban idyll, the police find a buried wooden box containing a famous and well-respected prosecutor. Martin Beck and his police team initially suspect a highly criminal MC-leader of the attack, but one pretty soon has to re-evaluate the case once the MC-leader is found murdered in a similar wooden box. Soon, more wooden boxes are found and the police realize that they are part of a cat and mouse game with a crazy serial killer. The investigation soon shows that there is a vague connection between the victims in the shape of a 9 year old event, but what Martin Beck does not suspect is that his own life too is at stake, as the murderer has chosen him as the next victim.
When the charred remains of woman are found, Säpo, the Swedish Security Services, suspect Gunvald Larsson of being mixed up in her murder. The dead woman was wanted internationally and a member of a group of militant eco-activists carrying out attacks around the world. Gunvald sets out on his own to find the woman's murderer, with Säpo on his heels. Martin Beck is ordered to arrest Gunvald and his loyalty to his colleague is now put to the test.
Nothing is the way it should be in the Beck group. Josef is suspended, pending an internal investigation. Klas Fredén offers to help Josef. But nothing in life is free.
