Burning Water by Mercedes Lackey Book

Good condition, very little wear.
This is book #1 of the Diana Tregarde Investigation series. sexy witch who writes romances and a police detective who sees more than mortal man team up to battle an ancient Aztec god!
Dallas Police Detective Mark Valdez isn’t just any cop, he’s a psychic who knows that the cattle mutilations and torture murders he’s been investigating are somehow tied together. He also knows that his meager psychic abilities aren’t enough to identify the killers, much less stop them. Luckily, Mark has an ace up his sleeve: an attractive young romance novelist who happens to be a practicing witch. And not just any witch, either-Diana Tregarde is a Guardian, charged with protecting the Earth and all its creatures.