Dream Chaser ~ Sherrilyn Kenyon

This is the third in the Dream- Hunter novels and one of the Dark Hunter series. Xypher has spent the last several hundred years being tortured in Tartarus, and has been granted one month as a human, to exact his vengeance. Simone is a Medical Examiner for a collage in New Orleans. They are tied together by a set of bracelets designed to help kill gods, you kill on wearing the bracelet and the other will die, so attaching them to a human, makes it easy to kill a god. In the path to get the bracelets off, and move on with their lives, they learn more about each other and start to find similarities in their lives.