Ancient Roman slave-catcher, Aries, returns from a long pursuit to find that his anticipated reward has disappeared, his father, Titus Pomponius Basso, successful chariot-horse trainer in the Circus Maximus, has been falsely convicted of witchcraft and sold into slavery on a landed Etrurian estate, and his grandmother, Felicia, has gone into hiding in an attic deep in the slums of Rome, vowing to devote her life to the cause of the liberation of all who languish in chains. Rescue and vengeance, however, carry a price-learning the truth about his family's origins. In a comic interlude, an obsessed physician causes himself immense trouble trying to raise the money to buy and ravish a slave-girl. The slave-girl's beloved, a female gladiator, struggles mightily to thwart him.