In the film an ancient Lithuanian legend is told about an origin of amber. For the sake of love to fisherman Kastytis sea tsarevna Jurate offered herself up. Her fiance, terrible god Perkunas destroyed the amber castle where she lived and it scattered into a thousand slices.
A prince discovers an enchanted beauty turned into a frog by Koschei the Immortal. After Koschei steals her again, the prince goes on a dangerous quest to free the land of the evil.
