Twenty-five years after an uneasy peace settled over the galaxy, the assassination of the newly elected Coalition President shatters the fragile alliance between humanity's three great factions — the United Earth Federation, the Aeon Illuminate, and the Cybran Nation. The story follows three commanders drawn into the unraveling conflict: Dominic Maddox, a UEF officer torn between duty and his Illuminate wife; Thalia Kael, an Illuminate warrior fighting to restore her people's glory; and Ivan Brackman, a Cybran clone serving his creator. As their paths cross, they uncover the machinations of a mysterious operative named Gauge and the secret of "Shiva Prime," an ancient device with the power to reshape worlds and reignite total war.