This is a series of books which takes inspiration in the Vampire: the Masquerade setting, but clearly takes liberties with it too. The books deal with a Kindred who calls himself the Red Death, and which is trying to somehow take over the (under)world.
First off, assuming you know nothing of the universe before reading the novels, you can mostly follow everything that is said in the story. The main characteristics of vampires, and the various "societies" are described with enough details to have an overall view of the vampiric society—albeit with some serious flaws wrt in-canon stories that would later be written in both game books and other novels.
Second, if you know the universe, you'll probably cringe at many things that are described. I know some people have an issue with vampires being able to basically throw fireballs at others. The supernatural power itself (ie, throwing fireballs) isn't an issue according to me. The fact that the vampires doing so are not frenzying more often as a result, however, is rather problematic. Even when we discover where this power comes from, this is highly problematic for a V:tM inspired book.
Finally, while I do like how sometimes Metuselah influence is described w.r.t. manipulating human populations and (much) younger vampires alike, in fine, I find there is little horror left, and in particular, there is little personal horror (contrary to some other V:tM players, I don't mind the "Indiana Jones" feel V:tM can sometimes have, jumping from country to country, but the horror of being a vampire, and the horror felt by humans being victims of vampires, should be present somehow). I do dislike some elements that seemd to have been added mostly to advertise for other books/games that were being sold at the time (namely, Mage: the Ascension).
To conclude: I read the three books rather quickly, which indicates that the story itselfs flows relatively easily. However I feel like the author had to shoehorn some portions of his story, which indicates (to me) that he may have felt constrained in how to tell some of the story, and at the same time, he did take liberties with the V:tM universe which creates cognitive dissonance for fans. You can read it, but be aware this is more of an alternate storyline/timeline thing than anything else.