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Hydra is an international, large, criminal organization. Today, a congress of representatives of the criminal intelligence department of various states is gathering on the ship. Colonel Didenko will represent Ukraine at the congress. In the evening, the boys learn shocking news: the steamship on which Stepan Ivanovich was on was blown up. The police say about several dozen dead. The local terrorist organization "Anarchy Without Borders" claimed responsibility for the terrorist attack. Didenko is not among the victims found, but forensic experts claim that it is unlikely that anyone survived such an explosion. The boys have a difficult task: to find Didenko, if he is still alive, and to find out who carried out the terrorist attack.