Yarrick: Imperial Creed (Yarrick #1)

Yarrick: the very name carries the weight of legend, of great deeds and of wars won for the Imperium.
But Sebastian Yarrick, who fought on Armageddon, who Space Marine Chapter Masters show their fealty to on bended knee, was not always Lord Commissar. He was once just a man, a newly minted officer from the ranks of the schola progenium.

His first mission under the tutelage of Lord Commissar Rasp was on Mistral. Here, an uprising of barons had upset the delicate balance of power. But, as Yarrick was soon forced to learn, Mistral and Imperial politics are often murky, the truth seldom clear cut. As war engulfs the world, a plot unravels that pits old friends against one another and fashions unusual alliances. Chaos cults, the fanatical Adepta Sororitas and clandestine inquisitors all stand between Yarrick and his mission. Here is where the legend began. In this crucible was Lord Commissar Sebastian Yarrick forged in blood.