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The beginning of the sixteenth century. In a dream, Roman sees a city that disappears in flames. Apparently, this portends a difficult fate, a life full of adventures and struggles... His mother gives her son a silver amulet with a strange symbol to ward off evil. But what does the young man care about omens? Roman meets a girl he loves and, together with his faithful comrade Ivan, joins a Cossack band, where they receive nicknames such as Mamai and Holota. One day, the Cossacks capture the Crimean Khan's ambassador. The latter confuses Mamai with the news that the amulet hanging on his chest is the family sign of the Gerai dynasty. Is there a secret here? Time will tell whether the ambassador was lying or not. And now Mamai and Holota join Prince Ostroh's army to defend their native land...