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 dead body is found, and police detective Mårten Späck draws the conclusion that a serial suicide killer is at large. Späck with his colleagues Grünvald Karlsson and Irene Snusk suspect a gang who distributes pirated DVDs of 'bottom-of-the-barrel' Swedish movies.