H.P. Lovecraft's REANIMATOR is a story that he wrote for cash and is something of an iffy entry into his collection. Indeed, it's generally agreed that the Stuart Gordon horror-comedy was far better than the original source material thanks to the hilarious yet disturbing performance of Jeffrey Combs (of Star Trek and Gotham fame). Still, Peter Rawlik has decided to make it the basis of his story and he makes an entertaining tale even if it has some serious flaws.
Most of the book is written in the same style as Reanimator itself with the protagonist dictating events to us. That means that there's very little dialogue in the story and a poor sense of tension since, well, we know the protagonist survives. He is a victim of Herbert West's criminal actions and attempts to get revenge in a round about way by becoming even better at Reanimation than West himself. This leads him on a global journey that Forest Gumps through the Cthulhu Mythos and includes references to many other stories--some of which are demythologized to being less about aliens or gods than the misuse of the reagent.
While entertaining, the simple fact is the protagonist is basically Herbert West in that he's an emotionless fanatic who commits all manner of atrocities in the name of science while being occasionally horrified by how far he's willing to go. He doesn't even care that much about revenge after the first few chapters. As such, I have to question why Pete Rawlik didn't just do a book from West's perspective to begin with.