Captured and castrated as a boy, Zeno is sold into slavery in Constantinople. Bought by the greatest scholar of the age, he is soon drawn into a labyrinth of sex, heresy, murder and intrigue. Though the empire is threatened by a heretic uprising and a barbarian invasion, its rulers think only of themselves. In the cruel and glittering city of Constantinople, a ruthless general, a bisexual boy-emperor, a worldly patriarch, a peasant usurper and a half-Viking...