Aestred Thurge: Pyre of Faith (Warhammer 40K) by Dane Ware (HB)

As a Reliquant at Arms tasked with delivering sacred relics safely to their resting places, Aestred Thurga can think of no worse failing than losing such an artefact to the hands of the enemy. When the unthinkable happens, and an ambush by Chaos cultists sees them take the Sword of Saarim, Aestred throws herself into a vicious battle against the Ruinous Powers to reclaim both the relic and her honour, as the cult overwhelms the planet from within.