Shurik, better known in the diving environment as the "Black Macedonian", has been diving abroad for many years, where he got as a teenager after the death of his father in a gangster showdown. Shurik's only relatives in Russia remain his grandmother Pelageya Ivanovna, a retired police colonel. Unexpectedly, she asks her grandson to return. Shurik, over whom clouds have been gathering for a long time because of his involvement in illegal underwater archeology, responds to his grandmother's invitation and returns to Kaliningrad. At this time, several murders of divers engaged in underwater amber collection take place on the Baltic coast.
