This book, like Death's Mistress is a convoluted mess. I can't think of anything else to say other than I was hoping for better.
what bothered me the most about this book was how much it seemed--to me at least-- to borrow from Hideyuki Kikuchi's Vampire Hunter D series. I was actively thinking that if Dorina were male and the books were set in 12,090 common era, she'd probably be remarkably similar to D.
Anyhow, I think my head hurt just trying to make sense of portals, vampire zombies, and the whole nine yards.