In the year 5122, law and order across the Imperium's vast reaches is a difficult thing to maintain. Enter the Quaestors. They are judges, law bringers, and when need be, executioners. When imperial Quaestor Aurelia Cossea enlists Proselyti troopers to depose a corrupt governor, Sergeant Saito Shimada willingly accepts. A convert to imperial ways, he has devoted himself to a safer, more united galaxy. But when the assignment is interrupted by betrayal and the bizarre appearance of two troopers from an earlier Prosyleti mission, Saito's commitment to his Imperium masters is sorely tested. Under-equipped and cut off from support, the hunters will become the hunted, forced to navigate the twisted maze of an ancient city in a desperate bid for escape, hampered by bad intel, the governor's minions, and the two deserters who've returned from the dead.