Warhammer 40k - Sisters of Battle Series by James Swallow

When a mysterious messenger contacts the Adepta Sororitas, Celestian Miriya must travel to Hollos and pass judgement on the world. Will she find a world embracing the Emperor’s truth or one in need of cleansing? Her decision will liberate or condemn an entire planet.



THE STORY
In the grim nightmare future of the 41st millennium, the witch-hunting zealots of the the Sisters of Battle stand between humanity and damnation. From the elite Seraphim warriors to the berserk Sisters Repentia, they are the strong arm of the Ecclesiarchy and the brutal hammer of witches.
When dangerous psychic heretic Torris Vaun escapes from her custody, Seraphim Miriya is disgraced in the eyes of her fellow sisters and superiors. Following Vaun's trail to the planet Neva, Miriya takes her sisters in pursuit and, along with Hospitalier Sister Verity, starts her investigations. When they uncover a terrifying plot that could threaten the future of the Imperium, is Miriya's and Verity's faith strong enough for them to triumph?



THE STORY
The Sisters of Battle are the Emperor's most devout worshippers, fierce warriors preaching the purity of the Imperium and scourging their enemies with bolter and flamer. On a distant world, the Ecclesiarchy outpost of Sanctuary 101, was wiped out by an implacable foe - the fearless, soulless necrons. Now, a mission of the Sisterhood has returned to reconsecrate the site - but the metallic nightmares still lurk in the darkness, guarding a secret that has lain dormant for millennia. A vicious battle will be fought - one that can only end in the total destruction of the unrelenting xenos, or the annihilation of the proud Sororitas.