The older the zombie, the bigger the death needed to raise it.

After a few centuries, the only death big enough is a human sacrifice. I know because I m an animator. My name is Anita Blake. Working for Animators, Inc. is just a job
like selling insurance. But all the money in the world wasn t enough for me to take on the particular job Harold Gaynor was offering. Somebody else did, though
a rogue animator. Now he s not just raising the dead… he s raising Hell. And it s up to me to stop it.