Glevum, AD 188. Lying in his sick bed, weak and disoriented, Libertus is strictly forbidden visitors. But when Marcus Septimus forces his way in, desperate to speak to the pavement-maker, Libertus knows that something is seriously wrong. Marcus's beloved wife Julia and their baby son have disappeared without a trace. And now a ransom note has arrived: unless Marcus uses his power to release a certain political prisoner, he will never see his family alive again. Libertus is well aware of Marcus's dilemma: give in to the kidnappers and sacrifice his reputation for being fair and unmoved by bribery, or stand firm and provoke unimaginable consequences. But Libertus has also made a powerful enemy. How can he help his patron -- and himself -- this time?