Moral and ethical questions always make a subject more interesting, if only because there are no easy answers.
IIRC, Tanya Huff did interesting things with zombies in one of the "Blood Price" books, but then she always does interesting things, no matter what the subject.
no subject
IIRC, Tanya Huff did interesting things with zombies in one of the "Blood Price" books, but then she always does interesting things, no matter what the subject.