The girl Ganus and her younger brother Andriyko, whose mother took the Horde into captivity, lived on their farm, and the father who went to free her disappeared himself. Cossack Stepan is being groomed for Ganus, but she only gave word to marry after her parents returned. But all three are in danger because they are being persecuted by the devil cast out of hell by Satan himself, ordering to destroy at least one human soul. And they can only be protected by the Cossack Saber and the Holy Cross.