" The hero in a romance is the most important challenge the heroine must face and conquer. The hero is her real problem in the book, not whatever trendy issue or daring adventure is also going on in the subplot. In some way, shape, or form, in some manner either real or perceived on the heroine's part, the hero must be a source of emotional and, yes, sometimes physical risk. He must present a genuine threat. "

― Jayne Ann Krentz