It is 48 BC and Caesar is master of Rome, but Pompey is at large in the huge recruiting grounds of the east with a core of powerful officers, nominally representing the senate in absentia. As the general deals with matters in the city his army gathers at the coast, waiting to cross the sea and fight that worst of all conflicts: civil war.

This will be no easy campaign for Caesar and his officers. Fronto and Galronus, both preparing to join the campaign, know that they will face appalling odds right from the outset, for Pompey's immense navy controls the seas, and the force he has gathered in the east will dwarf that of Caesar, commanded by shrewd officers like the great Scipio and the turncoat Labienus.

From the bitter Adriatic Sea to the mountains and valleys of the Balkans, Fronto and his men strive to stop Pompey and bring the war to an end, heading for a conflict the likes of which none have ever seen. Hades awaits the legions of Rome on the plains of Pharsalus.