I do not like writing negative reviews. An accomplishment like having a book published, even a short one, even a mediocre one, should be respected if not celebrated.
Sadly 'Apostle' is a book that can not aspire to the heights of mediocrity.
Please keep in mind that reviews by their nature contain a great deal of personal bias.
The TLDR is as follows:
Have you ever put too much curry on your food making it dry and flavorless? That's how it feels to read 'Apostle'. It took me two and a half months to read threw its 246 pages, that's how unappetizing this was. It commits the greatest sin that any piece of art or entertainment can, it was terribly boring and uninteresting.
The review:
(Minor spoilers)
Let me begin by saying that I genuinely wanted to like 'Apostle', its premise sounded like just what I wanted out of Warhammer 40k, it managed to convince me to expand my pallet.
The problems started as early as the prologue. In it a Palatine walks into the room holding a power sword only for it to be a chain-sword not a paragraph later. She did not switch weapons nor did some miracle alter her armament, this is an inconsistency.
I normally wouldn't pay much attention to an honest mistake were it an one-off but this inconsistency is immediately followed by a palatine so bloodthirsty and effective that she makes fully fledged chaos space marines run for their lives, a warrior who has experience and training in fighting specifically such a foe having our protagonist dead to rights.
Our main character Cerastes proceeds to survive this encounter by praying to the chaos gods. To its credit the book says that the prayer was so vile that it made the palatine hesitate for a heartbeat, please note that a heartbeat is the unit the book uses. The palatine has at this point her sword raised and Cerastes pinned, lets see how Cerastes used that heartbeat, shall we?
And I quote:
"Cerastes cursed her. He cursed her in the tongue of Chaos. He roared at her, and he called upon the gods to bear witness to his fidelity to the Word. He called upon the Word itself, on the deepest truths of being, to come to his aid and show this pitiable fanatic the depths of her self-deception. He roared in anger, then in pain, the true gods answered and demanded their price. A network of wounds opened on his face and scalp, as though mesh of razor wire had been drawn tight around his skull. He bled in streams, and a rain of tiny flaps of skin fell to the floor like shed scales. (...) Violet energy erupted from the fallen star. A crackling web spread in an instant over the floor and walls and dome of the chapel. The chamber screamed in pain, and it split open. The walls fell away into a swirl of warp energy and the void. The ceiling caved in, the decks above giving way, and the floor dropped beneath Cerastes."
I do not know whose heartbeat that was but I suggest that they go to the hospital immediately.
Cerastes somehow didn't die then and there despite being in a situation where the average human had the time and equipment to kill him, let alone a palatine that is a little over-tuned in my humble opinion. (I know that on the tabletop a properly built palatine can give a knight a walloping but in the lore they are just experienced sisters of battle. I don't think they should be quite able to reliably take down Astartes.)
Cerastes then proceeded to float threw the vacuum of space to safety, and the palatine wasn't sucked out with him because we need an antagonist for later.
Alright, enough with the prologue lets get to the rest of the book. There is only one real character here, there are many individuals but only one is focused on enough to matter and that means that Cerastes himself has to shoulder the responsibility of being the only interesting person in the entire planet. Sadly he is a basic bitch.
Let me introduce you to Cerastes : When things are going well he is the fated one and his victory is predetermined, when they aren't he has doubts, also he is constantly serious. Not someone who knows they are evil and has fun with it, no glorious bastard, no cultured yet dour philosopher. Just insecure, self-important and boring. To the writer's credit that is how someone like Cerastes would probably be in real life and it is poetic that the self-proclaimed enlightened superhuman is plagued by flaws so pedestrian and better fit for the mortals he looks down on, but that doesn't mean he is interesting or fun to read about.
(Major spoilers ahead)
Then nothing of importance happens until the end, events technically occurred but we started the book setting up a final "climactic" battle between Cerastes and the palatine and it is made clear that she will only step foot on the planet once the situation has gone more than critical thus making such an event an inevitability and Cerastes even more annoying for not being able to make up his mind for five minutes on if he is the greatest that ever was or a simple fool.
But it is quite easy to summarize something so devoid of substance so here it is:
Cerastes grows his flock, the planetary government counterattacks and his flock is reduced, that will happen multiple times and every time Cerastes will face a crises of faith, as in the same crises of faith over and over again, especially since he keeps making unforced errors. To the writer's credit whenever Cerastes performs a dark miracle it is wonderfully described.
And finally the ending:
(I will be spoiling the ending here, if you have chosen to disregard my review please stop reading, it is the best part of a book with no good parts.)
The palatine arrives and armies class as we are finally allowed to have some fun. At this point enough death and destruction has taken place on the planet for a demonic invasion to occur. Loose ends are tied up and Cerastes achieves the symbolic and physical destruction of the planet he so despises, as does the palatine because their feelings on whether the planet should be destroyed or not are surprisingly similar. Thus the final moral victory will be decided via duel. Cerastes thinks he saw a silver halo on the palatine's head but the emperor likes gold so he was probably hallucinating due to exhaustion. After a quick and flashy fight the palatine impales him with her quantumly challenged sword and flees the dying planet while Cerastes somehow doesn't die once again when by all accounts he should and the book ends with him planning to do more minor villain stuff.
Conclusion:
A friend of mine says that David Annandale is a writer with some pretty good work under his name. Therefore I assume that for some reason he was rushed or distracted or his heart wasn't in it when he was writing 'Apostle'. I hear he is a horror writer and he did a great job when describing the effects of chaos manifesting, if only the rest of the book was of that quality. If you are interested in his work I recommend reading something else.
Final grade: Cerastes do you need some water? All this talking mast have made your throat as dry as the writing. Don't worry, I am sure we can fit a five minute brake in this heartbeat.