Beck and his men investigates a murder of a Russian woman. At the same time as SÄPO (The Swedish Security Agency) sees a chance of getting a Russian in the embassy deported.
A serial killer that decapitates people is on the loose in the Stockholm subway. Martin Beck and his colleagues try to catch the killer, while the panic in the city increases.
Jens and wife Åsa pack up the family to spend the summer in the archipelago. The idyll, however, does not appear when it comes out that the in-laws do not intend to leave the cottage to Jens and Åsa, but plan to spend the whole summer there with them.
