The Book of Blood is an anthology/compilation of a black & white comic, a novella and four short stories, all themed around the Blood Angels Space Marines chapter.
I had the book forgotten in a shelve, because after reading the comic I wasn't specially enjoying the Space Hulk novella. As I ended up reading it alone, I recently decided to finish the book.
The results are that the comic is the best piece, then the short stories vary. This is my first reading about the Blood Angels specific lore, "vampirism" and the black rage, so while is interesting to see the differences from Dark Angels and Ultramarines (of whom I've read a few books) on most stories it feels like too exagerated, as if the bloodlust or the rage was terrible, while I had an image of some crazed marines but the rest more normal.
Not bad but I'm not impressed either... and as I said, the best part is the comic.