As the epic battle for Terra rages on and the future of humanity hangs in the balance, Nathaniel Garro fights amid the ashes and fire of the ruined Imperial Palace. From the brutal betrayal at Isstvan to the desperate escape of the Eisenstein, through the jungle of missions as an agent of Malcador the Sigillite, the former Knight-Errant's path led him inexorably towards a fate that could only end in bloodshed. Trying to protect Euphrati Keeler, the first saint of the Imperial Church, from the horrors of a titanic war, Garro must face his greatest enemy in one last devastating confrontation - his gene-father, former master and monstrous master of the Death Guard, the rebel Primarch Mortarion.