Once a Repentia, Sister Adamanthea of the Adepta Sororitas has returned to her order and taken the rank of Dominion Superior. But some sins remain too deep to truly escape… Leading her squad in an attempt to assassinate a commander of the heathen T'au Empire in the midst of a vicious battle, Adamanthea's desire to purge her sins upon the enemy remains strong. With her drive to punish the enemies of the Emperor conflicting with her orders, can she lead her squad to victory – or will her desperate need for vengeance doom them all?