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1349. Grand Duke Lubart Gediminovich, ruler of Galicia and Volhynia, is widowed, so he goes to Novogrudok to marry Princess Olga Konstantinovna of Rostov. The prince needs an heir and profitable connections, while for young Olga this marriage is a life-changing step. Will she be able to win the love or at least the favour of an older and more powerful man?"

While attending the wedding, the prince had no idea that his longtime rival, King Casimir of Poland, had entangled his state in a web of intrigue and treachery. In Lubart's absence, the boyars surrender most of the principality to Casimir. The Polish king is confident that he will take Rus from Lubart. But despite the evil fate, the prince is ready to fight for his country.