This is another Anita Blake book. She's the necromancer turned vampire hunter and protector of just about everything were. This is book 15 in the series. If you've been reading them all you have to keep going. If not, Hamilton's web site lists them all in order and you should start at the beginning.
Frankly, I liked the first books in the series better. Anita spent more time raising zombies and killing vampires back then. Now she spends most of her time in bed with vampires and weres of every stripe. Anita is part tiger, leopard, wolf, lion, and beast yet to be determined herself, but she's avoided the actual change so far. If you like intense descriptive sex scenes you'll appreciate the later books in the series. In spite of that, this novel is highly recommended.