Cicero has retired from politics. Julius Caesar – dictator, and commander of Rome’s armies – is assassinated. Cicero sees his death as an opportunity to restore the Republic but the assassins, Brutus and Cassius, dither as power in Rome begins to fall into the lap of Mark Antony.
Determined to prevent Antony imposing a military dictatorship on Rome, Cicero forms an unlikely alliance with the 19-year-old great-nephew and heir of Julius Caesar. Confident that he can control the boy and use him to destroy Mark Antony, Cicero sets out to save the Republic.