國際通緝的軍事環保分子被謀殺,瑞典保安警方 懷疑探員葛蘭私下在追緝兇手。當警方發現暗殺團即將再度出手,貝克探長必須與葛蘭合作才能阻止災難發生。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.