In this latest book of the Star Crusades Uprising series, the religious insurgency continues to spread through the weakened colonies of the Confederacy. Spartan, now a sergeant in the Marine Corps and his armoured platoon is rushed to the defence of New Carlos on the planet of Prime. The massive city is besieged by the terrifying biomech shock troopers, its fall is imminent. As the battles rage across the continent enemy agents continue to foment revolt throughout the remaining colonies in their struggle to bring the empire crashing down.