I agree with those calling this science fiction/horror with romantic elements, although "erotic" might be better than "romantic"? Basically it is about a cop hunting down a serial killer in the western US during summer, only both cop and serial killer are space aliens in heat. As in cat in heat, only their heat is brought on by hot weather. Oops. So they acquire human women on the way. Sounds like it's silly? It isn't. It's graphic and there is way too much disturbing interspecies sex and murder in it. Yet it kept me turning pages until the end. A strange book.