Iron Guard

Picked this up on a whim as a fan of 40k and the Imperial Guard. I'd never heard of a Clapham before and so thought I'd give it a try.
For establishing the world of the setting, this is one of the best books I have read from Black Library. The story is perfectly paced, with a tense, foreboding first half that keeps building until the inevitable reveal, whereupon the action keeps you on the edge of your seat while still providing pointed insight into the subtleties of the world's story.
The characters are all surprisingly likeable, with the several viewpoint protagonists having distinct characters and flaws that really encourages empathy and investment. The conclusion of some of their story arcs changed how I perceive their faction as a whole, and will stick with me for a long time.
All in all, a surprise gem from a writer still establishing himself in Black Library. I wouldn't hesitate to recommend it to anyone with even a passing interest in the setting

Awesome! The build up and characters kept me in suspense! All hail the Mordians!