Prince Wilhelm adjusts to life at his prestigious new boarding school, Hillerska, but following his heart proves more challenging than anticipated.
A girl goes missing somewhere in Ystad. It is obvious that she has seen something terrible and that someone wants her silenced. At the same time, a trial of human traffickers begins.
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.
