By chance, the priest Jesse Caster became the host within his very being of a strange creature named Genesis. This offspring of the union of an angel and a demon represents both a pure ideal and the quintessence of light, but also a mass of absolute evil. Genesis is the only being in the universe that can stand on equal terms with God, if He wishes, and its bearer automatically becomes the most powerful being in the material world. And this is the preacher Caster.