This was a fantastic book. It contains some of the best description I have read in the past forever. Let me explain without giving away too many spoilers for the story itself.
The tale centres around the actions of the Word Bearers against the Ultramarines to eliminate them from the Horus Heresy. One of their actions is to destory planetary defense systems and orbitals around the planet of Calth. The description I found amazing was how the destruction of the orbitals and ships affect the planet itself. The scope of the thought that has gone into this part of the novel are exceptional and the devastation of such is just mindblowing!
The pace of the novel keeps you wanting to know more. The stakes for the characters are expectionally high and the story pulls no punches in that regard. Characters are developed swiftly and are very relatable in my opinion. As a reader you care about what happens to them. Of course, there is the appearance of some old favourites as well and yes, you still want to call them jerks on reading this.
One thing I will say as a niggling point of contention is that some of the Space Marine Characters say things that seem mroe appropriate to the Guard. It is a minor point but I can understand how some people would find this jarring. I did, but the strength of the story, plot and pace glossed over this for me.
This is a fantastic read, a good step forward in the Horus Heresy and completely on point. Give it a read, it’s awesome!