Fabius Bile: Primogenitor
Fabius Bile Book 1
Exiled into the depths of the Eye of Terror for his dark deeds, former Emperor's Children Apothecary Fabius is drawn back to the Imperium in search of a secret that could be the key to saving his misbegotten life…
Read it because:
It's the start of a brand new series of twisted tales from the mind of an author for whom depraved antiheroes are his bread and butter. And Fabius' vile experiments and complete lack of morality make for a deeply entertaining – albeit monstrously disturbing – tale.